Feature Request: Project Workspace Navigation with Fuzzy Finder (`ccj` command)

Problem

Current Claude Code workflow for multiple projects requires:

1. Exit Claude from current project
2. cd /path/to/other/project
3. Restart Claude (losing session context)
4. Remember/type project paths manually

This creates friction when working across multiple Claude-enabled projects.

Proposed Solution

Add ccj (claude-code-jump) command with:

• Auto-discovery of Claude projects (.claude/, CLAUDE.md markers)
• Fuzzy finder selection (fzf-style) for quick project switching
• Recent project weighting (most-used projects appear first)
• Git worktree detection (include feature branch directories)
• Fallback option ("work here anyway" when starting Claude in non-Claude directory)

Implementation Approach

1. Project index stored in ~/.claude/project-index.json
2. Shell integration (ccj alias for quick access)
3. Claude Code hooks (update index on /init, track usage)
4. Backwards compatible (works with existing additionalDirectories)

Benefits

• Addresses friction identified in issues #215, #2180, #4050
• Familiar UX pattern (developers expect fzf-style selection)
• Complementary to existing multi-directory features
• Enables efficient git worktree workflows

Community Interest

Would this solve your multi-project navigation pain points?
Any additional features you'd want to see?

I'm willing to contribute the implementation if there's community interest.