WP-0004: ecosystem integration complete

Add Helix Forge correlation (HELIX_SESSION_UID env, metrics correlate),
artifact-store publish (metrics publish), activity-core ActivityDefinition
references, integration patterns docs, and canon/knowledge design artifacts.

docs/integrations/briefs/tdd-workflow-canon-brief.md

@@ -0,0 +1,44 @@
+# tdd-workflow — InfoTechCanon-style Brief
+
+Compact agent brief derived from `agents/agent-tdd-workflow.md` (metrics pilot).
+Reference for fleet-wide brief rollout.
+
+```yaml
+profile:
+  id: kaizen/tdd-workflow
+  version: "1.0"
+  domain: development-process
+  intent:
+    summary: Guide TDD8 ISSUE-TEST-RED-GREEN-REFACTOR-DOCUMENT-REFINE-PUBLISH cycles
+    outcomes:
+      - Acceptance criteria covered by tests before PUBLISH
+      - Sidequests tracked without blocking parent issues
+      - Workspace integrated cleanly via make tdd-finish
+  metrics:
+    primary:
+      name: test_pass_rate
+      target: 1.0
+      measurement: passing_tests / total_tests at PUBLISH
+    secondary:
+      - name: cycle_time_s
+        measurement: session duration (execution_time_s)
+    collection:
+      storage: .kaizen/metrics/tdd-workflow/
+      frequency: per_execution
+  idempotency:
+    signals:
+      - current_issue.json workspace state
+      - idempotency_key on metrics record
+  session_protocol:
+    start: read .kaizen/agents/tdd-workflow/memory.md
+    close:
+      - update memory.md sections
+      - kaizen-agentic metrics record tdd-workflow
+  ecosystem:
+    fleet_correlation: helix_session_uid (ADR-004)
+    optimizer: kaizen-agentic metrics optimize
+    evidence: kaizen-agentic metrics publish (optional)
+```
+
+Full specification: [agents/agent-tdd-workflow.md](../../../agents/agent-tdd-workflow.md).
+Pilot documentation: [wiki/AboutKaizenAgents.md](../../../wiki/AboutKaizenAgents.md).