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>

tools/lead-gen/find_leads.py

@@ -26,12 +26,11 @@ OUTPUT_DIR = Path(__file__).parent / "output"
 OUTPUT_DIR.mkdir(exist_ok=True)
 
 def get_brave_api_key():
-    """Get Brave API key from clawdbot config."""
-    config_path = Path.home() / ".clawdbot" / "clawdbot.json"
+    """Get Brave API key from echo-core config."""
+    config_path = Path.home() / "echo-core" / "config.json"
     if config_path.exists():
         with open(config_path) as f:
             config = json.load(f)
-            # Try tools.web.search.apiKey (clawdbot format)
             api_key = config.get("tools", {}).get("web", {}).get("search", {}).get("apiKey", "")
             if api_key:
                 return api_key