Fix product E2E with empty local maps

[FlowmemoryAI]

What changed

Fixes the remaining stale local-state case found on FalconXtreme: old devnet/local/state.json files can contain empty product maps, which were masking the committed product handoff maps.

• devnetMap now falls through empty local maps to populated committed handoff maps.
• The stale-devnet regression now includes empty token, pool, LP, swap, and bridge maps and asserts the smoke still finds token data.

Validation

Passed locally:

npm test --prefix services/control-plane
npm run flowchain:product-e2e