📝 docs: audit and correct all ADR statuses and content

Full pass over all 25 ADRs to align documentation with actual
implementation state. Changes by ADR:

README index: completely rewritten — previous table mapped numbers to
wrong titles from 0010 onward.

0008 (BDD Testing): added note that flat features/ structure and godog
CLI invocation are superseded by ADR-0024; framework decision stands.

0009 (Hybrid Testing): renamed from "Combine BDD and Swagger-based
testing" to "BDD Testing with OpenAPI Documentation"; clarified that
the SDK-testing layer was never built and has no open issue.

0013 (OpenAPI/Swagger): removed leftover merge conflict artifact
(=======) and duplicated 60-line block.

0015 (Cobra CLI): fixed status contradiction — body said "Implemented"
while footer said "Proposed". Now Accepted.

0018 (User Management): status Proposed → Accepted; system is fully
implemented (JWT, bcrypt, GORM repos all present).

0019 (PostgreSQL): status Proposed → Accepted (Partial); added warning
that sqlite_repository.go and gorm/driver/sqlite still present contrary
to ADR intent.

0021 (JWT Retention): fixed wrong cross-reference (previously cited
ADR-0009 "Hybrid Testing" as source of JWT multi-secret support); fixed
title number from "10" to "21"; clarified that base JWT is implemented
but the retention cleanup job is not.

0022 (Rate Limiting/Cache): added warning block linking to open Gitea
issue #13; changed all 20 false ✅ implementation checkboxes to ❌.

0023 (Config Hot Reloading): added note that BDD scenarios exist for
this feature but the feature itself is not yet implemented.

0024 (BDD Organization): status Proposed → Accepted; modular domain
structure is fully built.

0025 (BDD Scenario Isolation): status Proposed → Accepted (Partial);
Phase 1 done, Phase 2 blocked on ADR-0022.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

adr/0019-postgresql-integration.md

@@ -1,10 +1,13 @@
 # 19. PostgreSQL Database Integration
 
 **Date:** 2024-04-07
-**Status:** Proposed
+**Status:** Accepted (Partial)
+**Implementation Date:** 2026-04-08
 **Authors:** Product Owner
 **Decision Drivers:** Data Persistence, Scalability, Production Readiness
 
+> **⚠️ Pending cleanup:** `pkg/user/sqlite_repository.go` and `gorm.io/driver/sqlite` still present in the codebase. The ADR requires their removal, but no Gitea issue tracks this yet. The PostgreSQL implementation (`pkg/user/postgres_repository.go`) is complete and in use.
+
 ## Context
 
 The dance-lessons-coach application currently uses SQLite with GORM for the user management system (ADR 0018), but since there are no existing users or production data, we can implement PostgreSQL directly as our primary database without migration concerns.