v2.1.2 — Fix archival search routing

Fixes

• Fix search_archival / search_memory routing for Letta 0.16.x compatibility
• Route search queries to /v1/agents/{agent_id}/archival-memory/search
• Keep non-search list calls on /v1/agents/{agent_id}/archival-memory

Validation

• Added regression tests for search vs list endpoint routing
• Verified in production after redeploy: runtime logs confirm search requests hit /archival-memory/search

User impact

• Resolves Issue #134 where archival search returned 0 results despite passages existing

References

• Issue: #134