Bug: Workspace `rebuild_catalog()` Loads All Full Documents, Creating Memory Risk

[zTgx]

Description

When catalog.bin is corrupted or missing, Workspace::rebuild_catalog() iterates through all documents and calls load() to load the complete PersistedDocument (including DocumentTree + NavigationIndex + ReasoningIndex), solely to extract the DocCard.

For workspace mode (100+ documents), this means holding many complete documents in memory simultaneously.

Related Code

rust/src/storage/workspace.rs — rebuild_catalog() method

Suggested Fix

1. Stream processing: Load documents one by one, extract the DocCard, and release the document.
2. Alternatively, implement a lightweight DocCard extraction method on PersistedDocument to avoid deserializing the full tree.
3. Add memory usage monitoring logs.