docs(A1.9): Add comprehensive git source documentation and example repository

Phase 4 Complete:
- Updated README.md with git source usage examples and use cases
- Created docs/GIT_CONFIG_SOURCES.md (800+ lines comprehensive guide)
- Updated CHANGELOG.md with v2.2.0 release notes
- Added configs/example-team/ example repository with E2E test

Documentation covers:
- Quick start and architecture
- MCP tools reference (4 tools with examples)
- Authentication for GitHub, GitLab, Bitbucket
- Use cases (small teams, enterprise, open source)
- Best practices, troubleshooting, advanced topics
- Complete API reference

Example repository includes:
- 3 example configs (react-custom, vue-internal, company-api)
- README with usage guide
- E2E test script (7 steps, 100% passing)

🤖 Generated with Claude Code
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

configs/example-team/README.md

@@ -0,0 +1,136 @@
+# Example Team Config Repository
+
+This is an **example config repository** demonstrating how teams can share custom configs via git.
+
+## Purpose
+
+This repository shows how to:
+- Structure a custom config repository
+- Share team-specific documentation configs
+- Use git-based config sources with Skill Seekers
+
+## Structure
+
+```
+example-team/
+├── README.md           # This file
+├── react-custom.json   # Custom React config (modified selectors)
+├── vue-internal.json   # Internal Vue docs config
+└── company-api.json    # Company API documentation config
+```
+
+## Usage with Skill Seekers
+
+### Option 1: Use this repo directly (for testing)
+
+```python
+# Using MCP tools (recommended)
+add_config_source(
+    name="example-team",
+    git_url="file:///path/to/Skill_Seekers/configs/example-team"
+)
+
+fetch_config(source="example-team", config_name="react-custom")
+```
+
+### Option 2: Create your own team repo
+
+```bash
+# 1. Create new repo
+mkdir my-team-configs
+cd my-team-configs
+git init
+
+# 2. Add configs
+cp /path/to/configs/react.json ./react-custom.json
+# Edit configs as needed...
+
+# 3. Commit and push
+git add .
+git commit -m "Initial team configs"
+git remote add origin https://github.com/myorg/team-configs.git
+git push -u origin main
+
+# 4. Register with Skill Seekers
+add_config_source(
+    name="team",
+    git_url="https://github.com/myorg/team-configs.git",
+    token_env="GITHUB_TOKEN"
+)
+
+# 5. Use it
+fetch_config(source="team", config_name="react-custom")
+```
+
+## Config Naming Best Practices
+
+- Use descriptive names: `react-custom.json`, `vue-internal.json`
+- Avoid name conflicts with official configs
+- Include version if needed: `api-v2.json`
+- Group by category: `frontend/`, `backend/`, `mobile/`
+
+## Private Repositories
+
+For private repos, set the appropriate token environment variable:
+
+```bash
+# GitHub
+export GITHUB_TOKEN=ghp_xxxxxxxxxxxxx
+
+# GitLab
+export GITLAB_TOKEN=glpat-xxxxxxxxxxxxx
+
+# Bitbucket
+export BITBUCKET_TOKEN=xxxxxxxxxxxxx
+```
+
+Then register the source:
+
+```python
+add_config_source(
+    name="private-team",
+    git_url="https://github.com/myorg/private-configs.git",
+    source_type="github",
+    token_env="GITHUB_TOKEN"
+)
+```
+
+## Testing This Example
+
+```bash
+# From Skill_Seekers root directory
+cd /mnt/1ece809a-2821-4f10-aecb-fcdf34760c0b/Git/Skill_Seekers
+
+# Test with file:// URL (no auth needed)
+python3 -c "
+from skill_seekers.mcp.source_manager import SourceManager
+from skill_seekers.mcp.git_repo import GitConfigRepo
+
+# Add source
+sm = SourceManager()
+sm.add_source(
+    name='example-team',
+    git_url='file://$(pwd)/configs/example-team',
+    branch='main'
+)
+
+# Clone and fetch config
+gr = GitConfigRepo()
+repo_path = gr.clone_or_pull('example-team', 'file://$(pwd)/configs/example-team')
+config = gr.get_config(repo_path, 'react-custom')
+print(f'✅ Loaded config: {config[\"name\"]}')
+"
+```
+
+## Contributing
+
+This is just an example! Create your own team repo with:
+- Your team's custom selectors
+- Internal documentation configs
+- Company-specific configurations
+
+## See Also
+
+- [GIT_CONFIG_SOURCES.md](../../docs/GIT_CONFIG_SOURCES.md) - Complete guide
+- [MCP_SETUP.md](../../docs/MCP_SETUP.md) - MCP server setup
+- [README.md](../../README.md) - Main documentation