Trace Sync and State Handoff

Resident/fleet foundations use explicit trace sync and state handoff instead of hidden shared mutable memory.

Trace sync

Trace sync moves ordered trace records from a local buffer to an index or aggregator. Sync must validate:

• run identity;
• contiguous sequence numbers;
• event identity;
• hash-chain continuity where available;
• duplicate batches without duplicating records;
• missing or corrupted segments as fail-closed errors.

Trace sync does not repair, renumber, or rewrite trace records.

State handoff

State handoff exports an explicit state snapshot or read-only reference. A receiver validates owner tenant/agent/run, state head, parent linkage, snapshot or state hash, trace linkage, and work-order authority before import or inspection.

Failed import leaves receiver state unchanged.

Replay

Replay can explain interruption, handoff, import, rejection, and resume facts. It does not re-sync traces, re-import snapshots as mutation, or execute adapters.