feat: C3.5 - Architectural Overview & Skill Integrator

Implements comprehensive integration of ALL C3.x codebase analysis features
into unified skills, transforming basic GitHub scraping into comprehensive
codebase intelligence with architectural insights.

**What C3.5 Does:**
- Generates comprehensive ARCHITECTURE.md with 8 sections
- Integrates ALL C3.x outputs (patterns, examples, guides, configs, architecture)
- Defaults to ON for GitHub sources with local_repo_path
- Adds --skip-codebase-analysis CLI flag

**ARCHITECTURE.md Sections:**
1. Overview - Project description
2. Architectural Patterns (C3.7) - MVC, MVVM, Clean Architecture, etc.
3. Technology Stack - Frameworks, libraries, languages
4. Design Patterns (C3.1) - Factory, Singleton, Observer, etc.
5. Configuration Overview (C3.4) - Config files with security warnings
6. Common Workflows (C3.3) - How-to guides summary
7. Usage Examples (C3.2) - Test examples statistics
8. Entry Points & Directory Structure - File organization

**Directory Structure:**
output/{name}/references/codebase_analysis/
├── ARCHITECTURE.md (main deliverable)
├── patterns/ (C3.1 design patterns)
├── examples/ (C3.2 test examples)
├── guides/ (C3.3 how-to tutorials)
├── configuration/ (C3.4 config patterns)
└── architecture_details/ (C3.7 architectural patterns)

**Key Features:**
- Default ON: enable_codebase_analysis=true when local_repo_path exists
- CLI flag: --skip-codebase-analysis to disable
- Enhanced SKILL.md with Architecture & Code Analysis summary
- Graceful degradation on C3.x failures
- New config properties: enable_codebase_analysis, ai_mode

**Changes:**
- unified_scraper.py: Added _run_c3_analysis(), modified _scrape_github(), CLI flag
- unified_skill_builder.py: Added 7 methods for C3.x generation + SKILL.md enhancement
- config_validator.py: Added validation for C3.x properties
- Updated 5 configs: react, django, fastapi, godot, svelte-cli
- Added 9 integration tests in test_c3_integration.py
- Updated CHANGELOG.md with complete C3.5 documentation

**Related:**
- Closes #75
- Creates #238 (type: "local" support - separate task)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

configs/django_unified.json

@@ -43,7 +43,10 @@
         "django/views/**/*.py",
         "django/forms/**/*.py",
         "django/contrib/admin/**/*.py"
-      ]
+      ],
+      "local_repo_path": null,
+      "enable_codebase_analysis": true,
+      "ai_mode": "auto"
     }
   ]
 }

configs/fastapi_unified.json

@@ -39,7 +39,10 @@
       "code_analysis_depth": "surface",
       "file_patterns": [
         "fastapi/**/*.py"
-      ]
+      ],
+      "local_repo_path": null,
+      "enable_codebase_analysis": true,
+      "ai_mode": "auto"
     }
   ]
 }

configs/godot_unified.json

@@ -44,7 +44,10 @@
         "scene/**/*.cpp",
         "servers/**/*.h",
         "servers/**/*.cpp"
-      ]
+      ],
+      "local_repo_path": null,
+      "enable_codebase_analysis": true,
+      "ai_mode": "auto"
     }
   ]
 }

configs/react_unified.json

@@ -38,7 +38,10 @@
       "file_patterns": [
         "packages/react/src/**/*.js",
         "packages/react-dom/src/**/*.js"
-      ]
+      ],
+      "local_repo_path": null,
+      "enable_codebase_analysis": true,
+      "ai_mode": "auto"
     }
   ]
 }

configs/svelte_cli_unified.json

@@ -62,7 +62,9 @@
         "src/**/*.ts",
         "src/**/*.js"
       ],
-      "local_repo_path": "local_paths/sveltekit/cli"
+      "local_repo_path": "local_paths/sveltekit/cli",
+      "enable_codebase_analysis": true,
+      "ai_mode": "auto"
     }
   ]
 }