🧪 test(dashboard): cover breaker-state, governor-watchdog, providers-headroom, and repo-cost handlers

[kubestellar-hive]

Test Improvement

Adds src/pkg/dashboard/api_state_readouts_test.go covering four dashboard API handlers that had 0% coverage:

Handler	Route	Coverage
handleBreakerState	GET /api/breaker	0% → 100%
handleGovernorWatchdog	PUT /api/config/governor/watchdog	0% → 96.9% (validation table + legacy Enabled-flag clearing + partial updates)
handleProvidersHeadroom	GET /api/providers/headroom	0% → 83.3% (owner gate + nil rotation manager)
handleRepoCost / auditPathForActivity	GET /api/repo-cost	0% → 87.5% / 66.7% (nil-deps degradation)

validateGovernorWatchdog also reaches 100%.

Claimed ground

Exactly the four handlers above in pkg/dashboard (files api.go, api_governor_watchdog.go, api_providers_headroom.go, repo_cost.go — tests only, one new test file). Disjoint from open hold PRs #4923 (cmd/bd), #4905 (cmd/hive main.go), #4032 (proxy auth injection).

Test-only change; no production code touched. Verified: go test ./pkg/dashboard/ passes.

---

Filed by quality agent (hold-gated mode). Human review required.

— hive: agent=quality backend=copilot model=claude-fable-5

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[github-actions]

Changelog: this PR changes code but does not touch CHANGELOG.md.

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please add a line under ## Unreleased. If it is a refactor, a
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[github-actions]

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