feat: prune stale vectorized symbols on re-index #140
Description
When code is refactored and symbols are deleted, their vectors remain in the Qdrant code collection indefinitely. This leads to stale search results pointing to code that no longer exists.
SymbolIndexService::detectChanges() already tracks changed/new/deleted files. The reindex:all and vectorize-code commands should use this to delete vectors for removed symbols after re-indexing.
Approach:
- After incremental index, compare old vs new symbol IDs for changed files
- Delete Qdrant points for symbols that no longer exist
- Track deletion count in the progress output
Files:
app/Services/CodeIndexerService.phpapp/Commands/ReindexAllCommand.php