diff --git a/backend/src/main/java/org/raddatz/familienarchiv/audit/README.md b/backend/src/main/java/org/raddatz/familienarchiv/audit/README.md
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+# audit
+
+Append-only event store for all domain mutations. Every write across the application produces an `audit_log` row. The activity feed and Family Pulse dashboard aggregate from this table.
+
+## What this domain owns
+
+Table: `audit_log` (append-only by convention — no UPDATE or DELETE in application code).
+Features: log mutations, query activity feed, query per-entity history.
+
+**Admission criteria (why this is cross-cutting, not a Tier-1 domain):** consumed by 5+ domains; has no user-facing CRUD of its own; the data model is fixed (event log, not a business entity).
+
+## What this domain does NOT own
+
+Nothing beyond the log table. `audit/` is an infrastructure layer, not a business domain.
+
+## Public surface (called from other domains)
+
+| Method | Consumer | Purpose |
+|---|---|---|
+| `logAfterCommit(event)` | document, person, user, ocr, geschichte | Record a mutation event after the DB transaction commits |
+
+`logAfterCommit` is the only write-path. Query paths (`AuditLogQueryService`) are consumed by `dashboard/` and the activity feed route.
+
+## Internal layout
+
+- `AuditService` — `logAfterCommit()` (write)
+- `AuditLogQueryService` — query by entity, by user, for the activity feed
+- `AuditLog` (entity) → table `audit_log`
+- `AuditLogRepository`
+
+## Cross-domain dependencies
+
+None. `audit/` is consumed by other domains; it does not call out to any of them.
+
+## Frontend counterpart
+
+No direct frontend counterpart. Audit data surfaces in the `activity/` and `conversation/` frontend domains via the dashboard API.
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/dashboard/README.md b/backend/src/main/java/org/raddatz/familienarchiv/dashboard/README.md
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+# dashboard
+
+Stats aggregation for the admin dashboard and the Family Pulse widget. This is a derived domain — it has no tables of its own; all data is computed on-the-fly from Tier-1 domain data.
+
+## What this domain owns
+
+No entities. Routes: `/api/dashboard/*`, `/api/stats/*`.
+Features: document counts, person counts, publication stats, weekly activity data, incomplete-document list, enrichment queue, Family Pulse widget data, admin statistics.
+
+**Admission criteria (cross-cutting):** aggregates from 3+ domains; no owned entities.
+
+## What this domain does NOT own
+
+None of the underlying data — it reads from `document/`, `person/`, `audit/`, `notification/`, `geschichte/`.
+
+## Public surface
+
+`dashboard/` is a leaf domain — no other domain calls its services. It is the aggregator, not the aggregated.
+
+## Internal layout
+
+- `StatsController` — REST under `/api/stats`
+- `DashboardController` — REST under `/api/dashboard`
+- `StatsService` — aggregated counts (documents, persons, geschichten, incomplete, etc.)
+- `DashboardService` — activity feed composition, Family Pulse data
+
+## Cross-domain dependencies
+
+- `DocumentService.count()` — total document count (StatsService)
+- `DocumentService.getDocumentById(UUID)` / `getDocumentsByIds(List<UUID>)` — document enrichment for activity feed (DashboardService)
+- `PersonService.count()` — total person count (StatsService)
+- `TranscriptionService.listBlocks(UUID)` — transcription block lookup for resume widget (DashboardService)
+- `UserService.getById(UUID)` — actor name resolution in activity feed (DashboardService)
+- `CommentService.findAnnotationIdsByIds(...)` — annotation context lookup for activity feed (DashboardService)
+- `AuditLogQueryService.findMostRecentDocumentForUser()` / `getPulseStats()` / `findActivityFeed()` — audit-sourced feed rows (DashboardService)
+
+## Frontend counterpart
+
+Activity feed and Pulse widget are assembled in `frontend/src/lib/shared/dashboard/` and in the `aktivitaeten` route; no dedicated `dashboard/` lib folder.
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/document/README.md b/backend/src/main/java/org/raddatz/familienarchiv/document/README.md
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+# document
+
+The archive's core concept. A `Document` represents one physical artefact (a letter, a postcard, a photo) stored in MinIO and described by metadata.
+
+## What this domain owns
+
+Entities: `Document`, `DocumentVersion`, `TranscriptionBlock`, `DocumentAnnotation`, `DocumentComment`.
+Features: document CRUD, file upload/download, full-text search, bulk editing, transcription workflows, annotation canvas, threaded comments, thumbnail generation (PDFBox).
+
+## What this domain does NOT own
+
+- `Person` (sender / receivers) — referenced by ID, resolved via `PersonService`
+- `Tag` — referenced by ID; the join is on the document side but tags are owned by `tag/`
+- `AppUser` — comments reference `AppUser` IDs, but user management lives in `user/`
+- OCR processing — `ocr/` orchestrates jobs; `ocr-service/` executes them
+
+## Public surface (called from other domains)
+
+| Method | Consumer | Purpose |
+|---|---|---|
+| `getDocumentById(UUID)` | ocr, notification | Fetch a single document |
+| `getDocumentsByIds(List<UUID>)` | ocr | Bulk fetch for OCR job |
+| `findByOriginalFilename(String)` | importing | Deduplication during mass import |
+| `deleteTagCascading(UUID tagId)` | tag | Remove a tag from all documents before deleting it |
+| `findWeeklyStats()` | dashboard | Activity data for Family Pulse widget |
+| `count()` | dashboard | Total document count for stats |
+| `addTrainingLabel(...)` | ocr | Attach a confirmed sender label to a document |
+| `findSegmentationQueue(int limit)` / `findTranscriptionQueue(int limit)` / `findReadyToReadQueue(int limit)` | ocr | OCR pipeline queues |
+
+## Internal layout
+
+- `DocumentController` — REST under `/api/documents`
+- `DocumentService` — CRUD, search (JPA Specifications), bulk edit
+- `DocumentRepository` — includes bidirectional conversation-thread query
+- `DocumentSpecifications` — composable `Specification` predicates for search
+- `DocumentVersionService` / `DocumentVersionRepository` — append-only version history
+- `ThumbnailService` + `ThumbnailAsyncRunner` — PDFBox thumbnail generation (separate thread pool)
+- Sub-packages: `annotation/`, `comment/`, `transcription/`
+
+## Cross-domain dependencies
+
+- `PersonService.getById()` / `getAllById()` — resolve sender and receivers
+- `TagService.expandTagNamesToDescendantIdSets()` — tag filter expansion
+- `FileService.uploadFile()` / `downloadFile()` / `generatePresignedUrl()` — S3 I/O
+- `NotificationService.notifyMentions()` / `.notifyReply()` — comment mentions
+- `AuditService.logAfterCommit()` — every mutation is audited
+
+## Frontend counterpart
+
+`frontend/src/lib/document/README.md`
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/geschichte/README.md b/backend/src/main/java/org/raddatz/familienarchiv/geschichte/README.md
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+# geschichte
+
+Family stories — curated narrative pieces that weave together persons, documents, and commentary into a publishable article. German: *Geschichte* (story / history).
+
+## What this domain owns
+
+Entity: `Geschichte`.
+Lifecycle: `DRAFT → PUBLISHED` (only published stories are visible to non-authors).
+Features: story CRUD, rich-text editing with person and document cross-references, publish/unpublish toggle, comment thread (shared component from `shared/discussion/`).
+
+## What this domain does NOT own
+
+- `Person` or `Document` records — stories reference them by ID. Deleting a Person or Document does not cascade to Geschichte.
+- Comment storage — shared comment infrastructure is in `document/comment/` (or `shared/discussion/` on the frontend).
+
+## Public surface (called from other domains)
+
+| Method | Consumer | Purpose |
+|---|---|---|
+| `getById(UUID)` | notification | Resolve story context in mention notifications |
+| `list(...)` | dashboard | Recent stories for the activity feed |
+| `count()` | dashboard | Published story count for stats |
+
+## Internal layout
+
+- `GeschichteController` — REST under `/api/geschichten`
+- `GeschichteService` — CRUD, publish lifecycle
+- `GeschichteRepository` — list by status, author
+
+## Cross-domain dependencies
+
+- `PersonService.getById()` / `getAllById()` — resolve person references in story body
+- `DocumentService.getDocumentsByIds()` — resolve document references in story body
+- `AuditService.logAfterCommit()` — story mutations are audited
+
+## Frontend counterpart
+
+`frontend/src/lib/geschichte/README.md`
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/notification/README.md b/backend/src/main/java/org/raddatz/familienarchiv/notification/README.md
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+# notification
+
+In-app messages delivered in real time via SSE and persisted in the bell-icon dropdown. Notifications are created by other domains in response to events (comment mentions, replies).
+
+## What this domain owns
+
+Entity: `Notification`.
+Features: create and deliver notifications, unread count, mark-read, SSE real-time push, per-user delivery preferences (stored as fields on `AppUser`, managed by `user/`).
+
+## What this domain does NOT own
+
+- `AppUser` (recipient) — owned by `user/`
+- `Document` or `Geschichte` (notification context) — referenced by ID only
+
+## Public surface (called from other domains)
+
+| Method | Consumer | Purpose |
+|---|---|---|
+| `notifyMentions(mentionedUserIds, comment)` | document (comment) | Push mention notifications when a comment contains @mentions |
+| `notifyReply(reply, participantIds)` | document (comment) | Push reply notification to all thread participants |
+| `countUnread(userId)` | user session | Unread badge count in the nav bar |
+| `getNotifications(userId)` | dashboard / activity | Notification list for bell dropdown |
+| `markRead(id)` / `markAllRead(userId)` | notification controller | User-driven read-state updates |
+| `updatePreferences(userId, dto)` | notification controller | Per-user delivery preferences |
+
+## Internal layout
+
+- `NotificationController` — REST under `/api/notifications`
+- `NotificationService` — create, query, mark-read
+- `SseEmitterRegistry` — runtime-stateful component that keeps one `SseEmitter` per connected user. On `notifyMentions()` / `notifyReply()`, the service writes to `SseEmitterRegistry` to push real-time events. SSE connections go **backend → browser directly**, not via the SvelteKit SSR layer.
+- `NotificationRepository` — persisted notification rows
+- `NotificationPreferenceDTO` — read/write DTO for preference endpoints (prefs stored on `AppUser`)
+
+## Cross-domain dependencies
+
+**Outbound (this domain calls):**
+- `DocumentService.findTitlesByIds(List<UUID>)` — enriches notification DTOs with document titles for display in the bell dropdown
+
+## Frontend counterpart
+
+`frontend/src/lib/notification/README.md`
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/ocr/README.md b/backend/src/main/java/org/raddatz/familienarchiv/ocr/README.md
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+# ocr
+
+OCR/HTR pipeline orchestration. This domain manages job lifecycle and result ingestion — it does **not** perform OCR. Actual text recognition runs in the Python `ocr-service/` container (port 8000, internal network only).
+
+## What this domain owns
+
+Entities: `OcrJob`, `OcrJobDocument`, `SenderModel`.
+Features: start OCR jobs, track job lifecycle (`PENDING → RUNNING → DONE / FAILED`), stream transcription blocks back into `document/transcription/`, sender-model training, segmentation training.
+
+## What this domain does NOT own
+
+- Document content — `Document` and `TranscriptionBlock` are owned by `document/`
+- File storage — presigned MinIO URLs are generated by `filestorage/FileService` and passed to the OCR service
+- OCR processing — the Python `ocr-service/` executes Surya (typewritten) and Kraken (Kurrent/Sütterlin HTR) and streams results back
+
+## Public surface (called from other domains)
+
+| Method | Consumer | Purpose |
+|---|---|---|
+| `startOcr(documentId, ...)` | document | Trigger an OCR job for a document |
+| `getJob(UUID)` | document | Fetch job status |
+| `getDocumentOcrStatus(UUID)` | document | Per-document OCR status summary |
+
+## Internal layout
+
+- `OcrController` — REST under `/api/ocr`
+- `OcrService` — job creation, presigned URL generation, result ingestion
+- `OcrBatchService` — batch job workflows
+- `OcrAsyncRunner` — `@Async` execution of OCR jobs
+- `OcrTrainingService` — calls `/train` and `/segtrain` on the Python service (protected by `X-Training-Token` header)
+- `OcrJobRepository` / `OcrJobDocumentRepository`
+- `SenderModelRepository` — trained sender-recognition models
+- `OcrClient` (interface) / `RestClientOcrClient` — HTTP client for the Python OCR service; mockable for tests
+
+## Cross-domain dependencies
+
+- `DocumentService.getDocumentById()` / `getDocumentsByIds()` — resolve target documents
+- `DocumentService.addTrainingLabel()` — attach confirmed sender labels after training
+- `FileService.generatePresignedUrl()` — generate MinIO presigned URLs passed to the OCR service (PDF bytes never flow through the backend)
+- `AuditService.logAfterCommit()` — OCR job events are audited
+
+## Frontend counterpart
+
+`frontend/src/lib/ocr/README.md`
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/person/README.md b/backend/src/main/java/org/raddatz/familienarchiv/person/README.md
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+# person
+
+Historical individuals referenced by documents. A `Person` is a family member who appears as a sender or receiver in the archive — they are never login accounts.
+
+## What this domain owns
+
+Entities: `Person`, `PersonNameAlias`, `PersonRelationship`.
+Features: person CRUD, name alias management, person merge (deduplication), family-member designation, relationship graph, person type classification (FAMILY, CORRESPONDENT, INSTITUTION).
+
+## What this domain does NOT own
+
+- `AppUser` — login accounts are in `user/`. A `Person` record has no login credentials. The separation is deliberate: a historical family member from 1905 is never a system user.
+- Document content — `Person` records are referenced by documents (as sender/receiver), not the other way around.
+- Relationship rendering — the Stammbaum view is derived by the frontend from `PersonRelationship` data.
+
+## Public surface (called from other domains)
+
+| Method | Consumer | Purpose |
+|---|---|---|
+| `getById(UUID)` | document, geschichte, ocr | Fetch one person by ID |
+| `getAllById(List<UUID>)` | document | Bulk fetch for sender/receiver resolution |
+| `findAll(String q)` | document, dashboard | List all persons |
+| `findByName(String firstName, String lastName)` | document | Typeahead search |
+| `findOrCreateByAlias(String rawName)` | importing | Idempotent create during mass import; type classification happens internally |
+| `findAllFamilyMembers()` | dashboard | Family member list for stats |
+| `findCorrespondents()` | document | Correspondent list for conversation filter |
+| `count()` | dashboard | Total person count for stats |
+
+## Internal layout
+
+- `PersonController` — REST under `/api/persons`
+- `PersonService` — CRUD, merge, alias management, family-member designation
+- `PersonRepository` — sorted list, name search
+- `PersonNameAlias` / `PersonNameAliasRepository` — alternative name spellings
+- `PersonNameParser` / `PersonTypeClassifier` — name parsing utilities
+- `PersonSummaryDTO` — lightweight DTO for typeahead / list views
+- Sub-package: `relationship/` — `PersonRelationship`, `RelationshipService`, `RelationshipController`
+
+## Cross-domain dependencies
+
+- `AuditService.logAfterCommit()` — person mutations are audited
+
+## Frontend counterpart
+
+`frontend/src/lib/person/README.md`
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/tag/README.md b/backend/src/main/java/org/raddatz/familienarchiv/tag/README.md
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+# tag
+
+Hierarchical document categories. Tags form a tree via a self-referencing `parent_id` column and are applied to documents for filtering and browse navigation.
+
+## What this domain owns
+
+Entity: `Tag` (self-referencing `parent_id` tree).
+Features: tag CRUD, hierarchical deletion (cascade to descendants), tag typeahead, admin tag management (rename, reparent, merge).
+
+## What this domain does NOT own
+
+- Documents — the `document_tags` join table is on the document side. `Tag` does not hold document references.
+- Tag assignment — adding/removing a tag from a document is handled by `DocumentService`.
+
+## Public surface (called from other domains)
+
+| Method | Consumer | Purpose |
+|---|---|---|
+| `delete(UUID)` | document | Remove the tag record; called by `DocumentService.deleteTagCascading()` after all document references are unlinked |
+| `deleteWithDescendants(UUID)` | admin tag UI | Recursive subtree deletion |
+| `expandTagNamesToDescendantIdSets(List<String>)` | document | Expand tag filter to include descendant tags |
+
+## Internal layout
+
+- `TagController` — REST under `/api/tags`
+- `TagService` — CRUD, hierarchy traversal, cascade-delete coordination
+- `TagRepository` — find-or-create by name (case-insensitive), subtree queries
+
+## Cross-domain dependencies
+
+None. Documents reference tags; tags do not reference documents or other domains.
+
+## Frontend counterpart
+
+`frontend/src/lib/tag/README.md`
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/user/README.md b/backend/src/main/java/org/raddatz/familienarchiv/user/README.md
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@@ -0,0 +1,35 @@
+# user
+
+Login accounts and permission groups. An `AppUser` is a system user who can authenticate and act in the application — they are never a historical family member.
+
+## What this domain owns
+
+Entities: `AppUser`, `UserGroup`, password-reset tokens, invite tokens.
+Features: user CRUD, group CRUD, password change, password reset flow, invite links.
+
+## What this domain does NOT own
+
+- `Person` records — historical family members. An `AppUser` is never linked to a `Person`. This separation is intentional: a person who digitized letters in 2024 is not the same entity as their great-grandmother who wrote them in 1912. See `docs/GLOSSARY.md`.
+- Permission enforcement — `security/` owns `@RequirePermission` and `PermissionAspect`. `user/` only manages which permissions are stored on `UserGroup`.
+
+## Public surface
+
+`UserService` methods are consumed primarily by the security infrastructure and the admin UI. No other business-logic domain calls `UserService` directly.
+
+The Spring Security chain (via `CustomUserDetailsService` in `security/`) calls `AppUserRepository.findByUsername()` on every authenticated request.
+
+## Internal layout
+
+- `UserController` — REST under `/api/users` (current user, CRUD)
+- `AuthController` — password reset, invite flow
+- `UserService` — BCrypt-encoded passwords, group assignment
+- `AppUserRepository` — find by username (used by Spring Security)
+- `UserGroupRepository` — group and permission management
+
+## Cross-domain dependencies
+
+- `AuditService.logAfterCommit()` — user-management mutations are audited
+
+## Frontend counterpart
+
+`frontend/src/lib/user/README.md`
diff --git a/frontend/src/lib/document/README.md b/frontend/src/lib/document/README.md
new file mode 100644
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--- /dev/null
+++ b/frontend/src/lib/document/README.md
@@ -0,0 +1,36 @@
+# document (frontend)
+
+UI for the archive's core concept: viewing, uploading, editing, searching, bulk-selecting, and transcribing documents.
+
+## What this domain owns
+
+Components: `DocumentRow`, `DocumentThumbnail`, `DocumentTopBar`, `DocumentViewer`, `DocumentMetadataDrawer`, `DocumentEditLayout`, `DocumentStatusChip`, `UploadZone`, `BulkSelectionBar`, `BulkDropZone`.
+Utilities: `search.ts` (search-param helpers), `filename.ts` (filename formatting), `documentStatusLabel.ts` (i18n label mapping), `validateFile.ts` (upload validation), `groupDocuments.ts` (list grouping).
+Sub-folders: `annotation/`, `transcription/`, `viewer/`.
+
+## What this domain does NOT own
+
+- Person typeahead — `person/PersonTypeahead.svelte` (cross-domain import, allowed by ESLint rule)
+- Tag input — `tag/TagInput.svelte` (cross-domain import, allowed)
+- Shared discussion — `shared/discussion/` (comment/mention editor)
+
+## Key components
+
+| Component                   | Route used in                      | Notes                                |
+| --------------------------- | ---------------------------------- | ------------------------------------ |
+| `DocumentRow.svelte`        | `/` (search results), admin queues | Compact document card with thumbnail |
+| `DocumentViewer.svelte`     | `/documents/[id]`                  | PDF/image inline viewer              |
+| `DocumentEditLayout.svelte` | `/documents/[id]/edit`             | Full edit form with sticky save bar  |
+| `UploadZone.svelte`         | `/documents/new`, bulk upload      | Drag-and-drop file drop area         |
+| `BulkSelectionBar.svelte`   | `/documents` bulk mode             | Multi-select action bar              |
+
+## Cross-domain imports
+
+- `person/PersonTypeahead.svelte` — sender / receiver selection
+- `tag/TagInput.svelte` — tag chip input
+- `ocr/OcrProgress.svelte` — job status indicator in the document header
+- `shared/primitives/BackButton.svelte`, `shared/discussion/` — shared UI
+
+## Backend counterpart
+
+`backend/src/main/java/org/raddatz/familienarchiv/document/README.md`
diff --git a/frontend/src/lib/geschichte/README.md b/frontend/src/lib/geschichte/README.md
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+++ b/frontend/src/lib/geschichte/README.md
@@ -0,0 +1,34 @@
+# geschichte (frontend)
+
+UI for family stories: the rich-text editor, story cards, and story list view.
+
+## What this domain owns
+
+Components: `GeschichteEditor.svelte`, `GeschichtenCard.svelte`.
+
+## What this domain does NOT own
+
+- Comment/discussion UI — shared via `shared/discussion/` (same component used for document comments)
+- Person display — `person/PersonChip.svelte` is used inside story content (cross-domain import)
+- Document display — document references in stories use components from `document/`
+
+## Key components
+
+| Component                 | Used in                                      | Notes                                                              |
+| ------------------------- | -------------------------------------------- | ------------------------------------------------------------------ |
+| `GeschichteEditor.svelte` | `/geschichten/new`, `/geschichten/[id]/edit` | Rich-text editor with person/document @-mentions and inline embeds |
+| `GeschichtenCard.svelte`  | `/geschichten` (list), dashboard             | Story preview card with cover image and publish status             |
+
+## Audience note
+
+The `/geschichten` route primarily serves readers (younger family members on mobile). Cards must have ≥ 44 px touch targets. Status must not rely on color alone.
+
+## Cross-domain imports
+
+- `person/PersonChip.svelte` — inline person references in story content
+- `document/DocumentThumbnail.svelte` — inline document references
+- `shared/discussion/` — comment thread below published stories
+
+## Backend counterpart
+
+`backend/src/main/java/org/raddatz/familienarchiv/geschichte/README.md`
diff --git a/frontend/src/lib/notification/README.md b/frontend/src/lib/notification/README.md
new file mode 100644
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+++ b/frontend/src/lib/notification/README.md
@@ -0,0 +1,36 @@
+# notification (frontend)
+
+Bell-icon dropdown and real-time SSE connection for in-app notifications.
+
+## What this domain owns
+
+Components: `NotificationBell.svelte`, `NotificationDropdown.svelte`.
+Utilities: `notifications.svelte.ts` (Svelte 5 reactive store), `notifications.ts` (API helpers).
+
+## What this domain does NOT own
+
+- SSE infrastructure — the backend's `SseEmitterRegistry` manages the server-side emitter. The frontend establishes one `EventSource` connection per session. Connection management lives in `notifications.svelte.ts`.
+- Notification content rendering — notification payloads contain a `contextUrl`; the frontend navigates there on click.
+
+## Key design: SSE connection
+
+The SSE path is **backend → browser directly** (not proxied through SvelteKit SSR). The `EventSource` connects to `/api/notifications/stream`. On receive, the reactive store updates the unread count and the bell dropdown in real time.
+
+```
+Backend SseEmitterRegistry → /api/notifications/stream → EventSource in browser
+```
+
+## Key components
+
+| Component                     | Used in                       | Notes                                                     |
+| ----------------------------- | ----------------------------- | --------------------------------------------------------- |
+| `NotificationBell.svelte`     | global nav (`+layout.svelte`) | Bell icon with unread badge; opens `NotificationDropdown` |
+| `NotificationDropdown.svelte` | global nav                    | Scrollable list of recent notifications with mark-read    |
+
+## Cross-domain imports
+
+- `shared/primitives/` — icon, button primitives only
+
+## Backend counterpart
+
+`backend/src/main/java/org/raddatz/familienarchiv/notification/README.md`
diff --git a/frontend/src/lib/ocr/README.md b/frontend/src/lib/ocr/README.md
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+# ocr (frontend)
+
+UI for OCR job management, progress display, and sender-model training in the admin/enrichment panel.
+
+## What this domain owns
+
+Components: `OcrProgress.svelte`, `OcrTrigger.svelte`, `OcrTrainingCard.svelte`, `SegmentationTrainingCard.svelte`, `TrainingHistory.svelte`.
+Utilities: `translateOcrProgress.ts` (progress-state → display-string mapping), `training.ts` (training API helpers).
+
+## What this domain does NOT own
+
+- OCR processing — all text recognition runs in the Python `ocr-service/` container. The frontend shows job state; it does not run OCR.
+- Transcription block display — rendered by `document/transcription/` components.
+
+## Key components
+
+| Component                         | Used in                       | Notes                                                    |
+| --------------------------------- | ----------------------------- | -------------------------------------------------------- |
+| `OcrProgress.svelte`              | document header, enrich panel | Progress bar and status label for an active OCR job      |
+| `OcrTrigger.svelte`               | enrich panel, document detail | Button to start an OCR job; disabled when one is running |
+| `OcrTrainingCard.svelte`          | `/admin/ocr`                  | Trigger sender-model training; shows training history    |
+| `SegmentationTrainingCard.svelte` | `/admin/ocr`                  | Trigger segmentation training                            |
+| `TrainingHistory.svelte`          | `/admin/ocr`                  | List of past training runs with status                   |
+
+## Backend counterpart
+
+`backend/src/main/java/org/raddatz/familienarchiv/ocr/README.md`
diff --git a/frontend/src/lib/person/README.md b/frontend/src/lib/person/README.md
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+# person (frontend)
+
+UI for historical family members: typeahead selection, chip display, hover cards, genealogy graph, relationship management.
+
+## What this domain owns
+
+Components: `PersonTypeahead.svelte`, `PersonMultiSelect.svelte`, `PersonChip.svelte`, `PersonChipRow.svelte`, `PersonHoverCard.svelte`, `PersonTypeBadge.svelte`, `PersonTypeSelector.svelte`.
+Utilities: `personFormat.ts` (full-name formatting), `personLifeDates.ts` (birth/death display), `person-validation.ts` (form validation), `personHoverCard.ts` (hover-card controller).
+Sub-folders: `genealogy/` (Stammbaum view components), `relationship/` (relationship graph components).
+
+## What this domain does NOT own
+
+- Document content — displayed in `document/`
+- AppUser accounts — managed in `user/`
+
+## Key components
+
+| Component                  | Used in                                   | Notes                                                                               |
+| -------------------------- | ----------------------------------------- | ----------------------------------------------------------------------------------- |
+| `PersonTypeahead.svelte`   | document edit, geschichte, search filters | Single-person selector with debounced typeahead. Exported for use by other domains. |
+| `PersonMultiSelect.svelte` | document edit (receivers)                 | Chip-based multi-person selector                                                    |
+| `PersonChip.svelte`        | document rows, conversation view          | Compact display chip with link and hover card                                       |
+| `PersonHoverCard.svelte`   | person chips                              | Floating card with person summary on hover                                          |
+
+## Cross-domain imports
+
+- `shared/primitives/` — generic UI primitives
+- `shared/hooks/useTypeahead.svelte.ts` — typeahead keyboard/focus logic
+
+## Accessibility notes
+
+- `PersonChip` focus ring: `focus-visible:ring-2 focus-visible:ring-brand-navy`
+- `PersonTypeahead` dropdown navigable via keyboard (↑↓ Enter Escape)
+
+## Backend counterpart
+
+`backend/src/main/java/org/raddatz/familienarchiv/person/README.md`
diff --git a/frontend/src/lib/shared/README.md b/frontend/src/lib/shared/README.md
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+++ b/frontend/src/lib/shared/README.md
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+# shared (frontend)
+
+Cross-domain utilities and UI primitives. Any file here is consumed by two or more domain folders and has no domain identity of its own.
+
+## Admission criteria (what belongs here)
+
+A file belongs in `shared/` if it meets **all three** conditions:
+
+1. No domain identity — it does not represent a `Document`, `Person`, `Tag`, etc.
+2. Consumed by ≥ 2 domain folders — or is framework infrastructure that every domain depends on.
+3. Generic — could work in a different SvelteKit project with zero business-logic changes.
+
+If any condition fails, the file belongs in the domain folder of its primary consumer.
+
+## What this folder owns
+
+| Sub-folder / file | Purpose                                                                                                                             |
+| ----------------- | ----------------------------------------------------------------------------------------------------------------------------------- |
+| `api.server.ts`   | Typed `openapi-fetch` client factory — the standard entry point for all backend API calls in server-side load functions and actions |
+| `errors.ts`       | Mirror of the backend `ErrorCode` enum + `getErrorMessage()` → Paraglide i18n key mapping                                           |
+| `types.ts`        | Cross-domain TypeScript interfaces                                                                                                  |
+| `utils.ts`        | Pure utility functions (date formatting, sorting, debounce)                                                                         |
+| `relativeTime.ts` | Human-relative time formatting (`"2 days ago"`)                                                                                     |
+| `primitives/`     | Generic UI components: `BackButton.svelte`, form inputs, pagination, layout shells                                                  |
+| `discussion/`     | Comment/mention editor shared by `document/` and `geschichte/`                                                                      |
+| `dashboard/`      | Family Pulse widget and recent-activity components assembled in the `/` route                                                       |
+| `hooks/`          | Svelte 5 reactive hooks: `useTypeahead`, `useUnsavedWarning`                                                                        |
+| `services/`       | Generic client-side service helpers                                                                                                 |
+| `actions/`        | Shared SvelteKit form action utilities                                                                                              |
+| `server/`         | Server-only shared utilities (load function helpers)                                                                                |
+| `help/`           | Coach marks and empty-state components used across multiple domains                                                                 |
+
+## What does NOT belong here
+
+- Components owned by one domain — move to that domain's folder.
+- Domain-specific business logic — even if shared, it belongs in the owning domain's public surface.
+
+## Adding to shared/
+
+If you need to add a file here, confirm it meets all three admission criteria. If it's domain-adjacent, check whether the owning domain should export it as part of its public surface instead.
diff --git a/frontend/src/lib/tag/README.md b/frontend/src/lib/tag/README.md
new file mode 100644
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+++ b/frontend/src/lib/tag/README.md
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+# tag (frontend)
+
+UI for hierarchical document categories: tag chip lists, tag input with typeahead, and the admin tag-tree editor.
+
+## What this domain owns
+
+Components: `TagInput.svelte`, `TagChipList.svelte`, `TagParentPicker.svelte`.
+
+## What this domain does NOT own
+
+- Tag data management — CRUD is handled via the backend `tag/` domain
+- Document association — adding/removing tags from documents is in `document/`
+
+## Key components
+
+| Component                | Used in                     | Notes                                                                                                                            |
+| ------------------------ | --------------------------- | -------------------------------------------------------------------------------------------------------------------------------- |
+| `TagInput.svelte`        | document edit form          | Multi-tag chip input with typeahead. Supports free-text creation and selecting existing tags. Exported for use by other domains. |
+| `TagChipList.svelte`     | document rows, detail pages | Read-only display of a tag set                                                                                                   |
+| `TagParentPicker.svelte` | admin tag editor            | Tree-aware parent selection                                                                                                      |
+
+## Cross-domain imports
+
+- `shared/hooks/useTypeahead.svelte.ts` — shared typeahead logic for `TagInput`
+
+## Backend counterpart
+
+`backend/src/main/java/org/raddatz/familienarchiv/tag/README.md`
diff --git a/frontend/src/lib/user/README.md b/frontend/src/lib/user/README.md
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+++ b/frontend/src/lib/user/README.md
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+# user (frontend)
+
+UI for account management: profile editing, password change, and permission group management in the admin panel.
+
+## What this domain owns
+
+Components: `UserProfileSection.svelte`, `UserPasswordSection.svelte`, `UserGroupsSection.svelte`.
+
+## What this domain does NOT own
+
+- `Person` records — historical family members are entirely separate from login accounts. A user editing their profile is an `AppUser`; the historical persons in documents are `Person` entities. They are never linked.
+- User list or admin creation UI — those live in the `/admin` route, which assembles views from multiple domains.
+
+## Key components
+
+| Component                    | Used in                     | Notes                                |
+| ---------------------------- | --------------------------- | ------------------------------------ |
+| `UserProfileSection.svelte`  | `/settings` or profile page | Display name, email editing          |
+| `UserPasswordSection.svelte` | `/settings`                 | Password change form                 |
+| `UserGroupsSection.svelte`   | `/admin`                    | Per-user permission group assignment |
+
+## Cross-domain imports
+
+- `shared/primitives/` — generic UI primitives only
+
+## Backend counterpart
+
+`backend/src/main/java/org/raddatz/familienarchiv/user/README.md`
diff --git a/ocr-service/README.md b/ocr-service/README.md
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+++ b/ocr-service/README.md
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+# ocr-service
+
+Python FastAPI microservice that performs the actual handwritten text recognition (HTR) and OCR. The Spring Boot backend orchestrates jobs; this service executes them.
+
+## What this service owns
+
+- Text recognition: Surya (typewritten text) and Kraken (Kurrent/Sütterlin historical handwriting)
+- Baseline layout analysis: Kraken BLLA model
+- Sender recognition: trained per-archive sender models
+- HTTP API at port 8000 (internal Docker network — no external port)
+
+## What this service does NOT own
+
+- Job lifecycle — tracked in the backend's `ocr/` domain
+- MinIO storage — the service fetches PDFs via presigned URLs generated by the backend; it does not hold credentials
+- Transcription block storage — results are streamed back to the backend, which writes them to PostgreSQL
+
+## API endpoints
+
+| Endpoint | Auth | Purpose |
+|---|---|---|
+| `POST /ocr` | None (internal network only) | Run OCR on a PDF (presigned MinIO URL in request body) |
+| `POST /train` | `X-Training-Token` header | Trigger sender-model training |
+| `POST /segtrain` | `X-Training-Token` header | Trigger segmentation training |
+| `GET /health` | None | Health check |
+
+## Environment variables
+
+| Variable | Default | Required? | Sensitive? | Purpose |
+|---|---|---|---|---|
+| `TRAINING_TOKEN` | — | YES (prod) | YES | Guards `/train` and `/segtrain`. Do not leave empty in production. |
+| `ALLOWED_PDF_HOSTS` | `minio,localhost,127.0.0.1` | YES | — | SSRF protection — comma-separated allowed PDF source hosts. Never set to `*`. |
+| `KRAKEN_MODEL_PATH` | `/app/models/` | — | — | Directory where Kraken HTR models are stored (populated by `download-kraken-models.sh`) |
+| `BLLA_MODEL_PATH` | `/app/models/blla.mlmodel` | — | — | Kraken baseline layout analysis model. Auto-downloaded via `ensure_blla_model.py` on startup if missing. |
+
+## Key files
+
+| File | Purpose |
+|---|---|
+| `main.py` | FastAPI app, endpoint definitions, SSRF validation |
+| `engines/` | Surya and Kraken engine wrappers |
+| `models.py` | Pydantic request/response models |
+| `preprocessing.py` | PDF-to-image conversion before OCR |
+| `confidence.py` | Per-block confidence scoring |
+| `spell_check.py` | Post-OCR spell correction using historical dictionaries |
+| `ensure_blla_model.py` | Startup script that downloads the BLLA model if missing |
+| `entrypoint.sh` | Docker entrypoint — runs `ensure_blla_model.py` then starts the server |
+
+## Backend counterpart
+
+`backend/src/main/java/org/raddatz/familienarchiv/ocr/README.md`