ops: capture worker cgroup memory evidence

[seonghobae]

Summary

• attributes worker OOM only from Docker OOMKilled or cgroup v2 oom_kill, never exit 137 alone
• captures unchanged-container memory.current, memory.peak, memory.max, and local pressure events in non-identifying JSON
• records PostgreSQL cumulative WAL/checkpoint evidence while retaining ADR 0227 aligned-plan/apply boundary
• adds ADR 0247, APA 7 references, operator procedure, and exact feat(dashboard): quantify cases and preserve project journeys #640 gap snapshot

Verification

• uv run --extra dev coverage run -m pytest -q tests/test_worker_memory_evidence.py (15 passed)
• uv run --extra dev coverage report -m scripts/capture_worker_memory_evidence.py (100%)
• uv run --extra dev pytest -q tests/test_worker_memory_evidence.py tests/test_postgres_tuning_plan.py tests/test_public_docstrings.py tests/test_documentation_hygiene.py (62 passed)
• docker compose -p lineageweave config --quiet
• canonical one-second aggregate observation: healthy, no configured worker service memory limit/reservation, no new local pressure/OOM event; idle evidence only, not capacity acceptance

Safety

• no record content, record identifiers, container identifiers, or credentials are persisted
• no PostgreSQL or Compose setting is changed
• no arbitrary headroom multiplier or memory-limit proposal is emitted

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[devin-ai-integration]

Devin Review found 1 new potential issue.