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>

examples/org_config.yaml

@@ -1,6 +1,6 @@
-# Organization-Level AutoCoder Configuration
+# Organization-Level AutoForge Configuration
 # ============================================
-# Location: ~/.autocoder/config.yaml
+# Location: ~/.autoforge/config.yaml
 #
 # IMPORTANT: This file is OPTIONAL and must be manually created by you.
 # It does NOT exist by default.
@@ -22,7 +22,7 @@ version: 1
 # Organization-Wide Allowed Commands
 # ==========================================
 # These commands become available to ALL projects automatically.
-# Projects don't need to add them to their own .autocoder/allowed_commands.yaml
+# Projects don't need to add them to their own .autoforge/allowed_commands.yaml
 #
 # By default, this is empty. Uncomment and add commands as needed.
 
@@ -122,7 +122,7 @@ approval_timeout_minutes: 5
 #    Default commands: npm, git, curl, ls, cat, etc.
 #    Always available to all projects.
 #
-# 5. Project Allowed Commands (.autocoder/allowed_commands.yaml)
+# 5. Project Allowed Commands (.autoforge/allowed_commands.yaml)
 #    Project-specific commands defined in each project.
 #    LOWEST PRIORITY (can't override blocks above).
 #
@@ -165,7 +165,7 @@ approval_timeout_minutes: 5
 # ==========================================
 # To Create This File
 # ==========================================
-# 1. Copy this example to: ~/.autocoder/config.yaml
+# 1. Copy this example to: ~/.autoforge/config.yaml
 # 2. Uncomment and customize the sections you need
 # 3. Leave empty lists if you don't need org-level controls
 #