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_publish.py

@@ -2,7 +2,6 @@
 
 from __future__ import annotations
 
-import json
 from pathlib import Path
 from unittest.mock import patch
 
@@ -140,4 +139,4 @@ def test_publish_against_live_artifact_store(project_with_optimizer: Path):
         token=token,
     )
     assert result.package_id
-    assert result.files_uploaded >= 1
+    assert result.files_uploaded >= 1