WP-0001: feedback channels, CI, pre-commit, telemetry docs

Add kaizen-agentic feedback CLI, Gitea issue templates, CI workflow,
pre-commit hooks, FEEDBACK/TELEMETRY docs, and cross-platform path tests.
Improve CLI registry error messages; remove agents_backup scaffolding.
Apply black formatting across src/tests for CI consistency.

State Hub message sent to agentic-resources for Helix correlation doc link.

tests/test_metrics.py

@@ -104,4 +104,4 @@ class TestMetricsStore:
         assert agents == ["coach", "tdd-workflow"]
 
     def test_default_retention_matches_adr(self):
-        assert DEFAULT_RETENTION_DAYS == 180
+        assert DEFAULT_RETENTION_DAYS == 180