fix: avoid unbounded dashboard collection reads

[davidrobertson]

Summary

• stop the dashboard from auto-loading five unbounded state collections
• keep the bounded health, session, memory, graph, and audit cards accurate
• mark consolidation details as deferred rather than reporting false zeros

Root cause

The local semantic collection is about 17 MB. Listing it crosses the iii worker response limit, unregisters all functions, and makes later dashboard endpoints return 500 or 404 until reconnect.

Verification

• focused viewer tests: 6 passed
• build passes
• 1,643 unit tests pass, one skipped
• same fix is in upstream PR fix: serialize and deduplicate dashboard loading rohitg00/agentmemory#1233