feat(agentctl): governance visibility P0 — table/brief/archive + MCP reads

Add human-readable --format table, one-page brief, claim archive via docs
apply CAS, and four MCP readonly tools. Includes P1 console design doc
and engineering-tool test evidence.

scripts/tests/test_codegraph_governance.py

@@ -21,7 +21,8 @@ class CodegraphGovernanceTest(unittest.TestCase):
         self.root.mkdir()
         (self.root / 'scripts').mkdir()
         for name in ('agent-worktree.sh', 'agent_worktree.py', 'agentctl.py',
-                     'agentctl', 'agentctl_w4.py', 'agentctl_catalog.py'):
+                     'agentctl', 'agentctl_w4.py', 'agentctl_catalog.py',
+                     'agentctl_visibility.py'):
             shutil.copy2(SOURCE / name, self.root / 'scripts' / name)
         (self.root / 'configs').mkdir(parents=True, exist_ok=True)
         shutil.copy2(SOURCE.parent / 'configs' / 'agent-governance.json',