feat: add PostgreSQL operational evidence baseline

[seonghobae]

Summary

• add exact-migration catalog assertions for 16 tenant policies, enabled RLS, forced RLS, and the tenant/time audit export index
• add ADR-0002 and a PostgreSQL operational readiness runbook
• document the current evidence boundary without claiming retention purge, partitioning, backup/restore, rollback drills, or CSAP/SOC 2/NIST certification
• keep the append-only audit history explicit: future retention requires a governed archive/forward migration
• add the operational docs to the repository bootstrap validation contract

Evidence

• fresh PostgreSQL 18.4 migration check: REAL_OPERATIONAL_CATALOG passed policies=16 rls_enabled=16 forced_rls=16 audit_index=1
• cargo test --workspace --all-targets --locked
• cargo clippy --workspace --all-targets --locked -- -D warnings
• RUSTDOCFLAGS=-Dwarnings cargo doc --workspace --no-deps --locked
• cargo build --bin lms_api --locked
• cargo +1.97.1 fmt --all -- --check
• cargo +1.97.1 clippy --workspace --all-targets --locked -- -D warnings
• actionlint
• git diff --check

Gate

This is stacked on PR #15 and remains unmerged product evidence until an independent current-head review and required Checks pass. Merge only after re-fetching exact head bb6ec38 and confirming protected rules.

[seonghobae]

Current-head review request for bb6ec38. Please independently verify the catalog assertions, bootstrap doc paths, and that the ADR/runbook distinguishes observed evidence from unimplemented retention/rollback/partitioning claims. COMMENT only; no approval or protected-merge bypass is requested.

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