feat: WP-0005 adoption polish — doc sync, fleet parity, CI lint

- Add make agents-sync-package and release-check parity gate
- Add tests/test_packaged_agents_parity.py; sync packaged agents with agents/
- Update install docs (HELLO_WORLD, CLI_CHEAT_SHEET, AGENT_DISTRIBUTION)
- Expand PACKAGE_RELEASE.md secrets setup and pre-tag checklist
- Add flake8 to Gitea CI; CHANGELOG Unreleased for v1.2.0
- Expand INTEGRATION_PATTERNS activity-core handoff checklist

tests/test_packaged_agents_parity.py

@@ -0,0 +1,29 @@
+"""Verify packaged agent data matches canonical agents/ source."""
+
+from pathlib import Path
+
+import pytest
+
+ROOT = Path(__file__).resolve().parents[1]
+AGENTS_SRC = ROOT / "agents"
+AGENTS_PKG = ROOT / "src" / "kaizen_agentic" / "data" / "agents"
+
+
+def _agent_files(directory: Path) -> dict[str, Path]:
+    return {p.name: p for p in sorted(directory.glob("agent-*.md"))}
+
+
+def test_packaged_agents_match_source():
+    """Wheel data/agents must mirror agents/ (names and content)."""
+    src = _agent_files(AGENTS_SRC)
+    pkg = _agent_files(AGENTS_PKG)
+
+    assert src, "agents/ must contain agent-*.md files"
+    assert set(src) == set(pkg), (
+        f"agent file set mismatch\n"
+        f"  only in agents/: {sorted(set(src) - set(pkg))}\n"
+        f"  only in data/agents/: {sorted(set(pkg) - set(src))}"
+    )
+
+    drift = [name for name in src if src[name].read_text() != pkg[name].read_text()]
+    assert not drift, f"content drift in packaged copies: {drift}"