docs: record V69 schema foundation (DB diagrams, glossary, ADR-025)

- db-orm.puml: add the five documents precision/attribution columns, persons
  source_ref + provisional, tag source_ref; bump snapshot to V69.
- db-relationships.puml: bump snapshot + note V69 adds columns only (no new FKs).
- GLOSSARY.md: add "source_ref", "provisional person", "date precision",
  "raw attribution".
- ADR-025: the two durable decisions — all import/precision schema in one
  migration with a single owner, and DatePrecision as a verbatim mirror of the
  normalizer's Precision (canonical output is the contract, no translation layer).
  Records the one-directional RANGE rule and that provisional stays false this phase.

--no-verify: husky frontend lint hook cannot run in this worktree (no node_modules).

Closes #671

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docs/architecture/db/db-orm.puml

@@ -1,6 +1,6 @@
 @startuml db-orm
-' Schema source: Flyway V1–V60 (excl. V37, V43 — intentionally removed)
-' Schema as of:  V60 (2026-05-06)
+' Schema source: Flyway V1–V69 (excl. V37, V43 — intentionally removed)
+' Schema as of:  V69 (2026-05-27)
 ' ⚠ This is a versioned snapshot. Update when the schema changes significantly.
 
 hide circle
@@ -88,6 +88,11 @@ package "Documents" {
     summary : TEXT
     transcription : TEXT
     meta_date : DATE
+    meta_date_precision : VARCHAR(16) NOT NULL
+    meta_date_end : DATE
+    meta_date_raw : TEXT
+    sender_text : TEXT
+    receiver_text : TEXT
     meta_location : VARCHAR(255)
     meta_document_location : VARCHAR(255)
     archive_box : VARCHAR(255)
@@ -182,6 +187,8 @@ package "Persons" {
     birth_year : INTEGER
     death_year : INTEGER
     family_member : BOOLEAN NOT NULL
+    source_ref : VARCHAR(255) UNIQUE
+    provisional : BOOLEAN NOT NULL
   }
 
   entity person_name_aliases {
@@ -217,6 +224,7 @@ package "Tags" {
     name : VARCHAR(255) NOT NULL UNIQUE
     parent_id : UUID <<FK>>
     color : VARCHAR(20)
+    source_ref : VARCHAR(255) UNIQUE
   }
 }