Add microagents scaffolding for SDLC workflows

- Created ExampleAgent, BuildAgent, TestAgent, LintAgent, DocGenAgent, DeployAgent, DepUpdateAgent, RoadmapAgent under agents/
- Added CLI stubs and READMEs for each agent
- Updated AGENTS.md with all agent entries

Co-authored-by: openhands <openhands@all-hands.dev>

agents/DocGenAgent/README.md

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+# DocGenAgent
+
+DocGenAgent generates and optionally validates project documentation using Sphinx.
+
+## Requirements
+
+- Python 3.6+
+- Sphinx installed
+
+## Usage
+
+```bash
+./agents/DocGenAgent/main.py [--output-dir DIR]
+```
+
+### Options
+
+- `-o, --output-dir DIR`: Output directory for generated docs (default: `docs/_build`).
+
+## Examples
+
+Build docs:
+```bash
+./agents/DocGenAgent/main.py
+```

agents/DocGenAgent/main.py

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+#!/usr/bin/env python3
+
+import argparse
+import subprocess
+import sys
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="DocGenAgent: generate and validate documentation"
+    )
+    parser.add_argument(
+        '--output-dir', '-o',
+        default='docs/_build',
+        help='Output directory for generated docs'
+    )
+    args = parser.parse_args()
+
+    # Generate docs (e.g., Sphinx)
+    print(f"Building docs in {args.output_dir}...")
+    ret = subprocess.run(['sphinx-build', '-b', 'html', 'docs', args.output_dir])
+    if ret.returncode != 0:
+        print("Documentation build failed.", file=sys.stderr)
+        sys.exit(ret.returncode)
+
+    # Optionally validate
+    # ret = subprocess.run(['sphinx-build', '-b', 'linkcheck', 'docs', args.output_dir])
+    # if ret.returncode != 0:
+    #     print("Documentation validation failed.", file=sys.stderr)
+    #     sys.exit(ret.returncode)
+
+    print("Documentation generation complete.")
+    sys.exit(0)
+
+if __name__ == '__main__':
+    main()