Problem

Workspace indexing is synchronous with no progress indication. For large workspaces, indexing can take minutes with no feedback.

Research

• Continue.dev: AsyncGenerator yielding progress updates (progress float + description). React progress bar in UI.
• Khoj: BackgroundTasks for non-blocking re-indexing, no progress tracking.
• PrivateGPT: Batch/parallel ingestion modes, no user-facing progress.

Proposed approach

1. Add optional progress_callback: Callable[[int, int, str], None] to index_workspace_knowledgebase()
2. CLI /workspace index: print progress line (e.g., Indexing [12/45] docs/plan.md)
3. hermes workspace index: same progress display
4. For turn-scoped auto-indexing: no progress (fast due to debounce)
5. For gateway: log progress at info level

Related

Part of workspace foundation (#5840)