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>

ui/src/App.tsx

@@ -34,8 +34,8 @@ import { Button } from '@/components/ui/button'
 import { Card, CardContent } from '@/components/ui/card'
 import { Badge } from '@/components/ui/badge'
 
-const STORAGE_KEY = 'autocoder-selected-project'
-const VIEW_MODE_KEY = 'autocoder-view-mode'
+const STORAGE_KEY = 'autoforge-selected-project'
+const VIEW_MODE_KEY = 'autoforge-view-mode'
 
 // Bottom padding for main content when debug panel is collapsed (40px header + 8px margin)
 const COLLAPSED_DEBUG_PANEL_CLEARANCE = 48
@@ -264,7 +264,7 @@ function App() {
           <div className="flex items-center justify-between">
             {/* Logo and Title */}
             <h1 className="font-display text-2xl font-bold tracking-tight uppercase">
-              AutoCoder
+              AutoForge
             </h1>
 
             {/* Controls */}
@@ -376,7 +376,7 @@ function App() {
         {!selectedProject ? (
           <div className="text-center mt-12">
             <h2 className="font-display text-2xl font-bold mb-2">
-              Welcome to AutoCoder
+              Welcome to AutoForge
             </h2>
             <p className="text-muted-foreground mb-4">
               Select a project from the dropdown above or create a new one to get started.