docs(person): ADR-039, DB diagrams, and V76 deploy runbook note

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/architecture/db/db-orm.puml

@@ -1,6 +1,6 @@
 @startuml db-orm
-' Schema source: Flyway V1–V72 (excl. V37, V43 — intentionally removed)
-' Schema as of:  V72 (2026-06-08)
+' Schema source: Flyway V1–V76 (excl. V37, V43 — intentionally removed)
+' Schema as of:  V76 (2026-06-12)
 ' ⚠ This is a versioned snapshot. Update when the schema changes significantly.
 
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@@ -184,8 +184,10 @@ package "Persons" {
     title : VARCHAR(50)
     person_type : VARCHAR(20) NOT NULL
     notes : TEXT
-    birth_year : INTEGER
-    death_year : INTEGER
+    birth_date : DATE
+    birth_date_precision : VARCHAR(16) NOT NULL
+    death_date : DATE
+    death_date_precision : VARCHAR(16) NOT NULL
     generation : SMALLINT
     family_member : BOOLEAN NOT NULL
     source_ref : VARCHAR(255) UNIQUE

docs/architecture/db/db-relationships.puml

@@ -4,6 +4,8 @@
 ' ⚠ This is a versioned snapshot. Update when the schema changes significantly.
 ' Note: V69 adds columns only (persons.source_ref, tag.source_ref, document
 ' precision/attribution fields); no new FK relationships, so this diagram is unchanged.
+' Note: V76 swaps persons.birth_year/death_year for birth_date/death_date +
+' precision columns; columns only, no new FK relationships, diagram unchanged.
 
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