WP-0003 Part 5: tdd-workflow metrics pilot

Add metrics frontmatter and session-close recording to tdd-workflow,
document the reference implementation in wiki/AboutKaizenAgents.md,
and add an e2e test covering record → show → optimize → brief.

agents/agent-tdd-workflow.md

@@ -2,6 +2,21 @@
 name: tdd-workflow
 description: Expert guidance for the TDD8 workflow methodology, specializing in the comprehensive ISSUE-TEST-RED-GREEN-REFACTOR-DOCUMENT-REFINE-PUBLISH cycle with sophisticated sidequest management and proper test organization.
 category: development-process
+memory: enabled
+metrics:
+  primary:
+    name: test_pass_rate
+    description: Share of acceptance-criteria tests passing at PUBLISH
+    measurement: passing_tests / total_tests for the active issue workspace
+    target: 1.0
+  secondary:
+    - name: cycle_time_s
+      description: Wall-clock time from ISSUE start to PUBLISH
+      measurement: Session duration in seconds (execution_time_s in ADR-004)
+  collection:
+    frequency: per_execution
+    storage: .kaizen/metrics/tdd-workflow/
+    retention: 180d
 ---
 
 # TDDAi Assistant Agent
@@ -372,3 +387,20 @@ The comprehensive 8-step development methodology that transforms requirements in
 2. Update `## What Worked` and `## Watch Points` as needed.
 3. Append one line to `## Session Log`: `YYYY-MM-DD · <issue or feature> · <outcome>`.
 4. Bump `last_updated` to today and increment `session_count`.
+5. Record session metrics (ADR-004; adjust values to match outcome):
+
+```bash
+# Successful PUBLISH — all acceptance tests green:
+echo '{"success": true, "execution_time_s": <seconds>, "quality_score": 0.9, "primary_metric": {"name": "test_pass_rate", "value": 1.0, "target": 1.0}, "metadata": {"issue": "<NUM>", "phase": "PUBLISH"}}' \
+  | kaizen-agentic metrics record tdd-workflow --json --idempotency-key <session-id>
+
+# Incomplete or failed cycle:
+echo '{"success": false, "execution_time_s": <seconds>, "quality_score": 0.4, "primary_metric": {"name": "test_pass_rate", "value": <rate>, "target": 1.0}, "metadata": {"issue": "<NUM>", "phase": "<last-phase>"}}' \
+  | kaizen-agentic metrics record tdd-workflow --json --idempotency-key <session-id>
+```
+
+Shorthand when only outcome and duration matter:
+
+```bash
+kaizen-agentic metrics record tdd-workflow --success --time <seconds> --quality <0.0-1.0>
+```