docs: integrate RDS and ACK architecture memory

.project-docs/30-worklog/tasks/20260812-integrate-rds-postgres-4e61c2.md

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+# Task: Integrate RDS PostgreSQL support into main
+
+## Identity
+
+- Task ID: 20260812-integrate-rds-postgres-4e61c2
+- Mode: Integration
+- Branch: codex/20260812-integrate-rds-postgres-4e61c2-integrate-rds-postgres-4e61c2
+- Worktree: D:\Datas\OthersProjects\NianAIGC-integration-rds-4e61c2
+- Base commit: 84d84ba94f136f10624700e8d34ed19fc6fe7fe7
+- Owner: codex
+- Status: Planning
+
+## Scope
+
+- Integrate feature commit `84d84ba94f136f10624700e8d34ed19fc6fe7fe7` into the default branch.
+- Promote the completed RDS/ACK task's durable backend, migration, workload, and operational boundaries into canonical project memory.
+- Preserve the pre-existing project-document initialization in the occupied `main` worktree without adopting unrelated application changes.
+
+## Intent And Constraints
+
+- Use an exclusively owned integration worktree and repository integration lock.
+- Do not overwrite or delete the untracked `.project-docs` files in the occupied `main` worktree unless byte-equivalence with the committed initialization baseline is verified.
+- Record only confirmed RDS/ACK architecture and deployment facts; leave unrelated placeholder project positioning/domain memory untouched.
+- Keep live RDS migration, Docker runtime, and ACK rollout explicitly unverified.
+
+## Outcome
+
+- Integration in progress.
+
+## Verification
+
+- Source feature commit `84d84ba` is present and based directly on `main` through initialization commit `0bcb149`.
+- Source task final and incremental Sol reviews returned `PASS`.
+
+## Follow-ups
+
+- None recorded.
+
+## Promotion Candidates
+
+- None recorded.