feat(P09): capacity repo, scheduler, peer registry, idempotency, retry
Wave A of P02 (multi-node scheduling & job dispatch).
- internal/store/migrations/0005_node_capacity.sql — node_capacity
table (node_id PK, cpu_millicores, memory_mib, disk_mib, updated_at).
- internal/store/capacity_repo.go — CRUD for the table; ErrNotFound
semantics; List ordered by node_id.
- internal/store/capacity_repo_test.go — round-trip coverage.
- internal/engine/peer.go — Peer struct (NodeID, Address, ServerName,
CAPath, LastSeen, Capacity) and PeerRegistry (in-memory map with
sync.RWMutex; Add/Remove/Get/All/Len/UpdateLastSeen). All() returns
a stable-sorted snapshot for deterministic tests.
- internal/engine/scheduler.go — JobSpec {CPU, Mem, Disk}; Fits()
and Score() helpers; PickNode() does best-fit bin-packing with
deterministic tie-breaking by NodeID. Ties broken lexicographically.
- internal/engine/scheduler_test.go — best-fit, no-fit, tie-break,
and Fits() boundary coverage.
- internal/transport/idempotency.go — IdempotencyStore (in-memory,
TTL=5min); WithIdempotencyKey/IdempotencyKeyFromContext helpers.
Expired entries auto-evict on Get; Sweep() for bulk cleanup.
- internal/transport/idempotency_test.go — put/get, expiry, ctx.
- internal/transport/retry.go — RetryPolicy (100ms/5s/5attempts);
IsTransient() with explicit signature list (no net/error dep);
ErrTransient/ErrPermanent sentinels; Do[T] generic retry loop.
Auto-retry only when (verb is idempotent) OR (ctx has idempotency
key); otherwise transient errors bail on first attempt (REQ-037).
backoff() with 25% jitter, ctx cancellation respected.
---ci---
project: orca
phase: 9
milestone: v0.2
status: execute
---/ci---
ciagent
fc6a6c07e2