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_helix_correlation.py

@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 import json
-import os
 import sqlite3
 from pathlib import Path
 
@@ -158,4 +157,4 @@ class TestHelixCorrelationCli:
             ["memory", "brief", "tdd-workflow", "--target", str(tmp_path)],
         )
         assert brief.exit_code == 0
-        assert "## Performance Summary" in brief.output
+        assert "## Performance Summary" in brief.output