feat(protocol): define Agent Fleet protocol types and event schema (#3155)
Adds with the durable, serializable
contract for the v0.8.60 Agent Fleet control plane:
- FleetRun, FleetTaskSpec, FleetWorkerSpec, FleetHostSpec
- FleetWorkerStatus and FleetInboxEntry
- FleetWorkerEvent envelope with tagged lifecycle payloads:
queued, leased, starting, running, model_wait, running_tool,
heartbeat, artifact, completed, failed, cancelled, interrupted,
stale, restarted, escalated
- FleetArtifactRef, FleetScorerSpec, FleetRetryPolicy,
FleetAlertPolicy, FleetReceipt, FleetScore
Types are additive (unknown fields ignored by existing consumers) and
use stable snake_case JSON names. Includes JSON round-trip tests.
Closes #3155.
CodeWhale Agent
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