rebrand: rename AutoCoder to AutoForge across entire codebase

Complete project rebrand from AutoCoder to AutoForge, touching 62 files
across Python backend, FastAPI server, React UI, documentation, config,
and CI/CD.

Key changes:
- Rename autocoder_paths.py -> autoforge_paths.py with backward-compat
  migration from .autocoder/ -> .autoforge/ directories
- Update registry.py to migrate ~/.autocoder/ -> ~/.autoforge/ global
  config directory with fallback support
- Update security.py with fallback reads from legacy .autocoder/ paths
- Rename .claude/commands and skills from gsd-to-autocoder-spec to
  gsd-to-autoforge-spec
- Update all Python modules: client, prompts, progress, agent,
  orchestrator, server routers and services
- Update React UI: package.json name, index.html title, localStorage
  keys, all documentation sections, component references
- Update start scripts (bat/sh/py), examples, and .env.example
- Update CLAUDE.md and README.md with new branding and paths
- Update test files for new .autoforge/ directory structure
- Transfer git remote from leonvanzyl/autocoder to
  AutoForgeAI/autoforge

Backward compatibility preserved: legacy .autocoder/ directories are
auto-detected and migrated on next agent start. Config fallback chain
checks both new and old paths.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

server/services/process_manager.py

@@ -92,7 +92,7 @@ class AgentProcessManager:
         self._callbacks_lock = threading.Lock()
 
         # Lock file to prevent multiple instances (stored in project directory)
-        from autocoder_paths import get_agent_lock_path
+        from autoforge_paths import get_agent_lock_path
         self.lock_file = get_agent_lock_path(self.project_dir)
 
     @property
@@ -587,10 +587,10 @@ def cleanup_orphaned_locks() -> int:
                 continue
 
             # Check both legacy and new locations for lock files
-            from autocoder_paths import get_autocoder_dir
+            from autoforge_paths import get_autoforge_dir
             lock_locations = [
                 project_path / ".agent.lock",
-                get_autocoder_dir(project_path) / ".agent.lock",
+                get_autoforge_dir(project_path) / ".agent.lock",
             ]
             lock_file = None
             for candidate in lock_locations: