test(engine): coverage uplift to ≥70% (T01.4, REQ-057)
Add registry_test.go (NEW) covering NodeRegistry Join/Leave/Forget/
List/Get (success + not-found + duplicate), NewNodeRegistry nil-
logger, Audit Record success/error (sqlite-backed via openTestDB
pattern) + NewAudit nil-logger. Extend scheduler_test.go with
MemLocalNode/Capacity (happy + nil), JobSpecScore nil/over-capacity/
fits, JobSpecFits nil, PickNode empty. Extend dispatcher_test.go
with Submit error paths: bad spec, explicit target no-registry,
target peer-not-found, peer-pick missing CA, no peer registry, nil
capacity fallthrough, all-peers-fail PickNode.
Coverage: 65.1% → 88.9%. go test -race PASS. No production code
changed; T01.2 peerDispatcher seam NOT needed (error-path tests
via stubbed LocalExecutor + PeerRegistry reached 89% without it;
httptest.NewTLSServer was not required either since dispatchToPeer
CA-missing and PickNode-fail branches cover the remote path).
---ci---
project: orca
phase: 1
milestone: v0.8
status: execute
---/ci---
Jon Chery
40906a0697