feat: Add bd init --contributor and --team wizards

- Implement OSS contributor workflow wizard
  - Auto-detects fork relationships (upstream remote)
  - Checks push access (SSH vs HTTPS)
  - Creates separate planning repository
  - Configures auto-routing to keep planning out of PRs

- Implement team workflow wizard
  - Detects protected main branches
  - Creates sync branch if needed
  - Configures auto-commit/auto-push
  - Supports both direct and PR-based workflows

- Add comprehensive documentation
  - examples/contributor-workflow/README.md
  - examples/team-workflow/README.md
  - Updated AGENTS.md, README.md, QUICKSTART.md
  - Updated docs/MULTI_REPO_MIGRATION.md

Closes: bd-kla1, bd-twlr, bd-6z7l
Amp-Thread-ID: https://ampcode.com/threads/T-b4d124a2-447e-47d1-8124-d7c5dab9a97b
Co-authored-by: Amp <amp@ampcode.com>

examples/README.md

@@ -12,6 +12,8 @@ This directory contains examples of how to integrate bd with AI agents and workf
 <!-- REMOVED (bd-4c74): branch-merge example - collision resolution no longer needed with hash IDs -->
 - **[claude-desktop-mcp/](claude-desktop-mcp/)** - MCP server for Claude Desktop integration
 - **[claude-code-skill/](claude-code-skill/)** - Claude Code skill for effective beads usage patterns
+- **[contributor-workflow/](contributor-workflow/)** - OSS contributor setup with separate planning repo
+- **[protected-branch/](protected-branch/)** - Protected branch workflow for team collaboration
 
 ## Quick Start