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/ralph_prd_generator.py

@@ -421,7 +421,7 @@ def create_prd_and_json(project_name: str, description: str, workspace_dir: Path
     # Copiază template-uri ralph
     templates_dir = Path.home() / ".claude" / "skills" / "ralph" / "templates"
     if not templates_dir.exists():
-        templates_dir = Path.home() / "clawd" / "skills" / "ralph" / "templates"
+        templates_dir = Path.home() / "echo-core" / "skills" / "ralph" / "templates"
     
     if templates_dir.exists():
         # Copiază ralph.sh