[AZ-1074] [AZ-1075] Cycle 9 closeout: security, tests, metrics

Resolve F-AZ1074-1/2 (collection caps, generic gRPC internal errors).
Standalone integration compose stack, docs, security audit, perf and retro.

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/06_metrics/retro_2026-06-25_cycle9.md

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+# Retrospective — Cycle 9 (2026-06-25)
+
+**Tasks**: AZ-1074 (gRPC RouteTileDelivery service, 5 SP), AZ-1075 (gRPC integration tests, 3 SP). **2 tasks, 8 SP, 1 batch.**
+**Mode**: cycle-end (autodev Step 17). Step 16.5 (Release) **skipped** per user choice — matches cycles 1–8 pattern; changes uncommitted at retro time.
+**Previous retro**: `retro_2026-05-23_cycle8.md`
+
+## Implementation Summary
+
+| Metric | Cycle 9 | Δ vs cycle 8 |
+|--------|---------|--------------|
+| Tasks implemented | **2** | -3 |
+| Batches executed | **1** | -3 |
+| Total complexity delivered | **8 SP** | -9 SP |
+| Avg tasks / batch | **2** | +0.75 |
+| Blocked tasks | **0** | unchanged |
+| Implementation report | **YES** (`implementation_report_tile_provision_grpc_cycle9.md`) | maintained |
+
+## Quality Metrics
+
+### Code Review
+
+| Verdict | Count |
+|---------|-------|
+| PASS_WITH_WARNINGS | **1** (batch 01) |
+| FAIL | 0 |
+
+**Findings**: 2 Low (amd64 Docker pin documentation; ArgumentException detail string formatting).
+
+### Security Audit (Step 14)
+
+| Severity at audit | Post follow-up |
+|-------------------|----------------|
+| Medium 1 | **0** — F-AZ1074-1 resolved (collection caps) |
+| Low 1 | **0** — F-AZ1074-2 resolved (generic internal error) |
+
+Continues cycle-8 pattern of in-cycle Medium resolution.
+
+### Test & Perf Gates
+
+| Gate | Result |
+|------|--------|
+| Step 11 functional | **PASS** — 448 unit + integration |
+| Step 15 perf | **PASS** — 8/8 REST scenarios (gRPC unverified) |
+
+## Efficiency
+
+| Blocker | Resolution |
+|---------|------------|
+| Host port 5433 conflict (integration + perf) | Standalone `docker-compose.tests.yml`; perf used ephemeral compose override |
+
+## Trend Comparison
+
+| Metric | Cycle 8 | Cycle 9 | Change |
+|--------|---------|---------|--------|
+| Code review FAIL rate | 0% | 0% | unchanged |
+| Security Medium open (delta) | 0 (1 resolved in-cycle) | 0 (1 resolved in-cycle) | same pattern |
+| Perf scenarios pass | 8/8 | 8/8 | unchanged |
+| Project count | 9 | 10 | +1 (GrpcContracts) |
+
+## Top 3 Improvement Actions
+
+1. **Document parallel-Postgres dev workaround** (~1 SP): add `docker-compose.perf.yml` or documented `ports: !reset []` override to `_docs/02_document/deployment/containerization.md` so Step 11/15 don't rediscover the 5433 conflict each cycle.
+   - Impact: faster integration/perf runs on multi-project dev machines
+   - Effort: low
+
+2. **PT-10 gRPC stream perf scenario** (~3 SP): when streaming NFR is accepted, add harness scenario for `DeliverRouteTiles` (time-to-first-chunk, total stream duration, backpressure).
+   - Impact: closes Unverified gap from cycle 9 Step 15
+   - Effort: medium
+
+3. **REST error sanitizer sweep** (~2 SP): F-AZ795-1/2 carry-over — static 400 messages in `GlobalExceptionHandler` / upload filter.
+   - Impact: reduces cumulative Low security debt (5+ cycles)
+   - Effort: low–medium
+
+## Suggested Rule/Skill Updates
+
+| File | Change | Rationale |
+|------|--------|-----------|
+| `test-run/SKILL.md` perf mode | Note gRPC scenarios may be Unverified when only REST harness exists | Cycle 9 Step 15 |
+| `environment.md` or containerization doc | Postgres port conflict playbook | Recurring blocker |
+
+## Cycle 9 Verdict
+
+**Successful feature cycle** — gRPC delivery shipped with tests, security hardening, and green gates. Release deferred (user choice); commit/push remains operator action before production promotion.