cleanup: remove clawd/openclaw references, fix permissions, add architecture docs

- Replace all ~/clawd and ~/.clawdbot paths with ~/echo-core equivalents
  in tools (git_commit, ralph_prd_generator, backup_config, lead-gen)
- Update personality files: TOOLS.md repo/paths, AGENTS.md security audit cmd
- Migrate HANDOFF.md architectural decisions to docs/architecture.md
- Tighten credentials/ dir to 700, add to .gitignore
- Add .claude/ and *.pid to .gitignore
- Various adapter, router, and session improvements from prior work

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_cli.py

@@ -219,8 +219,8 @@ class TestRestart:
              patch("cli._get_service_status", return_value={"ActiveState": "active", "MainPID": "100"}), \
              patch("time.sleep"):
             cli.cmd_restart(_args(bridge=True))
-        # Should have called kill+start for both bridge and core
-        assert len(calls) == 4
+        # kill+start bridge, restart core
+        assert len(calls) == 3
 
     def test_restart_fails(self, iso, capsys):
         with patch("cli._systemctl", return_value=(0, "")), \