Add an optional 'ignore' field to collection config that accepts an array
of glob patterns to exclude from indexing. This allows collections to skip
specific subdirectories without needing separate collections.
Example YAML config:
personal:
path: ~/personal_synced
pattern: '**/*.md'
ignore:
- 'Sessions/**'
- 'archive/**'
The ignore patterns are passed to fast-glob's ignore option alongside the
existing hardcoded excludes (node_modules, .git, etc). Already-indexed
files matching new ignore patterns are deactivated on the next update.
Changes:
- Add ignore?: string[] to Collection interface
- Pass ignore patterns through to fast-glob in indexFiles()
- Show ignore patterns in collection list/status output
- 5 new CLI integration tests covering the feature
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