# 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.
