- Add `-path` force-exclude pattern (exact path match, highest precedence)
- Change `+path` force-include to exact path match (no glob)
- Manifest-excluded resources are now hidden from config (not toggleable)
- Config toggle uses `+` to enable and `-` to disable
- Settings paths resolve relative to settings.json location:
- Global: relative to ~/.pi/agent
- Project: relative to .pi
- Add baseDir to PathMetadata for proper relative path computation
- Update tests for new base directory and pattern behavior
fixes#951
Adds a new 'pi config' command with a TUI to list and toggle package
resources (extensions, skills, prompts, themes).
- Displays resources grouped by source (packages, user, project)
- Subgroups by resource type (Extensions, Skills, Prompts, Themes)
- Toggle enabled/disabled state with space
- Filter resources by typing
- Supports +pattern for force-include, !pattern for exclude
- Properly reads exclusion patterns from settings.json
fixes#938
