docs: Fix repository structure in README to match actual layout

- Remove two incorrect/outdated structure diagrams
- Replace with single accurate structure matching current repository
- Include .github/, .specify/, .vscode/ directories
- Show all spec feature directories (001-gdrive-url-header, 001-sitemap, 002-document-export)
- Accurate src/ structure with globalVariables/ and proxyScripts/ subdirectories
- Include Specify workflow infrastructure documentation

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

README.md

@@ -92,21 +92,6 @@ Rationale defined in constitution:
 2. **Direct Code Flow**: No dependency injection, no framework magic
 3. **YAGNI Principle**: No premature abstraction for a focused service
 
-### Structure
-
-```
-src/
-├── server.js           # HTTP server, config loader, validation
-├── proxy.js            # Request handler with FIFO queue integration
-├── drive-client.js     # Drive API integration with 50k limit enforcement
-├── sitemap-generator.js # Sitemap XML generation with RESTful URLs
-├── queue.js            # FIFO request queue (sequential processing)
-├── auth.js             # Service Account authentication
-├── logger.js           # Structured logging utility
-├── utils.js            # Request ID, validation
-└── xml-utils.js        # XML escaping
-```
-
 ## Testing
 
 ### Test Structure
@@ -209,22 +194,41 @@ All errors return **HTTP status code only** with **no response body** (per speci
 
 ```
 google-drive-content-adapter/
+├── .github/
+│   ├── agents/                     # Specify workflow agent definitions
+│   └── prompts/                    # Agent prompt templates
+├── .specify/
+│   ├── memory/
+│   │   └── constitution.md         # Project principles and standards
+│   ├── scripts/
+│   │   └── bash/                   # Specify workflow helper scripts
+│   └── templates/                  # Templates for spec, plan, tasks
+├── .vscode/
+│   └── settings.json               # VS Code configuration
 ├── config/
-│   └── default.json           # Configuration
+│   └── default.json                # Application configuration
+├── specs/
+│   ├── 001-gdrive-url-header/      # Source URL header feature
+│   │   ├── checklists/
+│   │   ├── contracts/
+│   │   ├── spec.md
+│   │   ├── plan.md
+│   │   ├── tasks.md
+│   │   └── ...
+│   ├── 001-sitemap/                # Sitemap generation feature
+│   └── 002-document-export/        # Document export feature
 ├── src/
-│   ├── server.js              # HTTP server
-│   ├── proxy.js               # Request handler (monolithic)
-│   ├── auth.js                # Service Account auth
-│   ├── logger.js              # Structured logging
-│   ├── utils.js               # Utilities
-│   └── xml-utils.js           # XML escaping
+│   ├── globalVariables/
+│   │   ├── google_drive_settings.json
+│   │   └── googleDriveAdapterHelper.js
+│   ├── proxyScripts/
+│   │   └── proxy.js                # Main request handler (monolithic)
+│   ├── logger.js                   # Structured logging utility
+│   └── server.js                   # HTTP server entry point
 ├── tests/
 │   ├── contract/                   # API contract tests
 │   ├── integration/                # Integration tests
 │   └── unit/                       # Unit tests
-├── specs/
-│   └── 001-drive-proxy-adapter/  # Feature spec, plan, tasks
-├── .env.example               # Environment template
 ├── package.json                    # Dependencies and scripts
 └── README.md                       # This file
 ```