Promote kaizen schedule to weekly cadence and add credential routing

- Switch coach and optimization agents from daily to weekly Monday crons
- Restore disabled tdd-workflow stanza; quote cron expressions
- Add credential routing guidance to AGENTS.md for Codex/Grok agents
- Wire credential-routing rule into CLAUDE.md for Claude Code sessions
- Scaffold kaizen agent memory files and record failed daily-triage run

.kaizen/schedule.yml

@@ -1,17 +1,18 @@
-# Kaizen scheduled agent execution (ADR-005)
-# Engagement: coulomb-loop — stabilize phase (daily crons per ADR-003)
-# Promoted 2026-06-18 after 3/3 bootstrap E2E cycles
+# Kaizen scheduled agent execution manifest (ADR-005)
+# Engagement: coulomb-loop — weekly operate cadence
+# Regulator promotes cadence per customer engagement policy (ADR-003).
+# Validate with: kaizen-agentic schedule validate
 version: '1'
 timezone: Europe/Berlin
 agents:
   coach:
-    cadence: daily
-    cron: "0 9 * * *"
+    cadence: weekly
+    cron: "0 9 * * 1"
     enabled: true
   optimization:
-    cadence: daily
-    cron: "0 10 * * *"
+    cadence: weekly
+    cron: "0 10 * * 1"
     enabled: true
   tdd-workflow:
     cadence: monthly
-    enabled: false
+    enabled: false