feat(pki): add Device CA for IoT fleet mTLS device identity - #25
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Vault PKI-backed Device CA, the X.509 counterpart to the existing PAM SSH CA (internal/sshca/) — a deliberately separate implementation and Vault mount so the two CAs never share a blast radius. - Per-device one-time bootstrap secret for first enrollment (not a fleet-wide shared credential): a leaked secret only mints a cert for the one device it was issued to. - Self-service certificate renewal over a dedicated mTLS listener, authenticated by the device's current certificate — no operator or bootstrap secret involved, runs unattended indefinitely. - Per-certificate revocation (device_certificates.status), independent of CA rotation — a stolen device doesn't have to wait for natural expiry. - Staged CA rotation state machine mirroring the SSH CA's idle/rotating/cutover_ready/rollback dual-CA grace-period pattern. - Revocation events dispatched via the connector with device_id/ tenant_id/serial always populated from the start.
![github-advanced-security[bot]](https://avatars.githubusercontent.com/in/57789?s=60&v=4){kind=small}
golangci-lint: defense -> defence (misspell), lowercase the ErrNotConfigured message (staticcheck ST1005).
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Summary
device.enrolled,device.cert.revoked) always carry device_id/tenant_id/serial.Test plan
go build ./...go vet ./...go test ./...— full suite green000182_device_pkiagainst a live Postgres instance