M4 slice c: health probes + backup/restore CLI#5
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Add internal/server/health.go with liveness (/healthz) and structured readiness (/readyz) handlers wired at the root mux. The readiness probe aggregates four component checks (KVM device, vault sentinel round-trip, dolt prober, audit-dir writability) into a single JSON envelope and returns 503 when any component fails. Probers are dependency-injected via Router.AttachHealthChecks so tests can fault each component independently. The existing /api/readyz handler is left untouched — it remains the narrow dolt-only probe that the SPA's degraded banner already consumes. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Add `gemba admin backup --out` / `gemba admin restore --from` for disaster-recovery snapshots. Backups are single tar.gz files containing the dolt data dir, per-workspace vault blobs, the audit log, and a manifest.json with per-entry sha256 checksums. Restore verifies every checksum and refuses to overwrite a non-empty target data dir unless --force is supplied (the only auto-mode-friendly use of force, gated to recovery flows). Tests round-trip a real *vault.boltVault and an audit chain: after restore vault.Inject returns the seeded plaintext and audit.Verify succeeds against the restored log. A corruption test asserts restore rejects a tampered tarball rather than silently extracting garbage. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
internal/server/health.goadds root-mux liveness (/healthz, always 200) and readiness (/readyz, aggregates KVM, vault, dolt, audit-dir component checks; 503 if any fail). Dependency-injected probers viaRouter.AttachHealthChecks. Existing /api/readyz untouched.gemba admin backup --outandgemba admin restore --fromproduce/consume a single tar.gz containing dolt data dir, vault blobs, audit log, and a per-entry sha256 manifest. Restore refuses to overwrite a non-empty target without --force.Test plan
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