dtoro c96c795126 test: add unit tests for 6 previously-untested packages (R7) ...

Added pure unit tests for all packages that had 0% coverage. Where pure
logic was entangled with DB calls, extracted testable helpers first.

internal/domain (0% -> 100%):
- TestIsNil, TestCanTransition (all 30 state transitions), TestSentinelErrors,
  TestSignalTransitionsComplete

internal/learning (0% -> 26.2%):
- Refactored processGroup to extract 4 pure helpers: countOutcomes,
  computeConfidence, shouldValidate, shouldQuarantine
- TestWilsonLowerBound (monotonicity, edge cases, sample-size cap)
- TestCountOutcomes, TestComputeConfidence, TestShouldValidate,
  TestShouldQuarantine (table-driven)
- Remaining gap: extractPatterns/processGroup DB calls need make test-db

internal/policy (39% -> 50%):
- Extracted determineRoute from ClassifySignal (pure route logic)
- TestDetermineRoute (7 cases covering global/entity kill-switches, approval)
- Remaining gap: ClassifySignal/computeBlastRadius need DB mock

internal/knowledge (0% -> 14.2%):
- TestContentHash, TestStr, TestStrSlice, TestMapVal, TestToPGArray
- Documented latent bug: toPGArray doesn't escape " or \\ in tags
- Remaining gap: ingest* functions need make test-db

internal/actuator (0% -> 14.7%):
- TestSSHErrorClassString, TestClassifySSHError (11 cases incl. net.Error mock)
- TestParseProcedure, TestSetDefaultSSHTimeout
- Circuit breaker full state-machine test (open/close/reset/per-target)
- Remaining gap: ExecuteProcedure/ProvisionLXC need SSH+DB fixtures

internal/scheduler (0% -> 7.3%):
- TestParsePingLatency (Linux/macOS formats), TestAllowlistedScript
- TestEvaluateSeverity (threshold logic, crit:0 skip, signalKind fallback)
- Remaining gap: checkHTTP/checkTCP need httptest; runCheckPass needs DB

internal/notifier (0% -> 6.4%):
- TestHashToken, TestGenerateApprovalToken (HMAC re-derivation)
- Remaining gap: checkReaction/sendMatrixAlert need httptest; DB funcs need
  make test-db

All tests pass with -race. domain hits its 60% gate at 100%. The remaining
packages need integration tests (make test-db) and/or httptest-based tests
to reach their coverage gates — tracked as follow-up.

2026-07-17 22:54:44 +02:00

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