Removing one RAG directory destroyed the whole shared ChromaDB collection
(all owners + base index) instead of just that directory's chunks. Shared
root cause: PersonalDocsManager.remove_directory called rebuild_index()
(delete_collection + recreate) then re-indexed only the remaining tracked
dirs (ownerless, never personal_dir). The targeted VectorRAG.remove_directory
that should have been used was itself broken (where={"source":{"$contains":dir}}
selects nothing on scalar metadata and would over-delete siblings), and the
dead do_manage_rag path fired a second unconditional rebuild.
- VectorRAG.remove_directory: select chunks in Python by a path-boundary match
on the stored absolute `source` (dir or dir+os.sep), abspath-normalized.
Keys on `source` (always written), never `owner` -- no migration.
- PersonalDocsManager.remove_directory: call the targeted remove instead of
rebuild_index() + partial reindex.
- do_manage_rag (dead code): drop the second rebuild_index() (hygiene).
- rag_server.py add path: abspath so indexed `source` matches the remove.
No schema change. Prevents future wipes (does not recover already-wiped
vectors). Adds hermetic regression tests at three layers.
Fixes#1660
Co-authored-by: Ethan <23321960+0xLeathery@users.noreply.github.com>
