Uncommitted migration work at the time of branch cleanup. Tagged as
checkpoint/m1-migration-wip so the commit survives git gc --prune=now.
Session context: Phase 3 Part B+C of the M-1 sentinel error migration
was in progress. 38 modified files, 4 new files (errors.go + errors_test.go
in internal/service/ and internal/api/handler/). Resume from this commit
via 'git checkout checkpoint/m1-migration-wip'.
Service layer (63 tests): certificate, agent, audit, job, notification,
policy, and renewal services with mock repositories covering threshold
alerting, deduplication, status transitions, and job processing.
Handler layer (46 tests): certificate and agent HTTP handlers using
httptest with mock service interfaces, covering success/error paths,
pagination, JSON marshaling, and path parameter extraction.
Integration (11 subtests): end-to-end certificate lifecycle test
exercising real services and Local CA issuer through HTTP API —
create cert, trigger renewal, process jobs, register agent, heartbeat,
verify audit trail.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
shankar0123