bug: dewey_reload returns success but graph_overview shows 0 pages until re-scan completes

[jflowers]

Summary

dewey_reload returns "Vault reloaded successfully" immediately, but dewey_graph_overview called right after shows 0 pages, 0 blocks, 0 links. The server appears to return before the vault re-scan is complete.

Reproduction

1. Verify server has content:

   dewey_health() → embeddingCount: 8127, sources with pageCount > 0
   

2. Call reload:

   dewey_reload() → "Vault reloaded successfully"
   

3. Immediately call overview:

   dewey_graph_overview() → {totalPages: 0, totalBlocks: 0, totalLinks: 0}
   

4. Subsequent calls to list_pages, search, get_page also return empty.

Expected Behavior

Either:

• dewey_reload should be synchronous — return only after the re-scan is complete and pages are available, OR
• dewey_reload should return a status indicating re-scan is in progress, and dewey_graph_overview / dewey_health should reflect the "reloading" state

Impact

• After a reload, the MCP server appears empty — all read tools return no results
• No way to tell when the reload has completed
• Agents calling reload to pick up new content get worse results than before the reload

Environment

• dewey version: dev
• Backend: obsidian (default)
• Server: dewey serve --vault . via OpenCode MCP