feat(onboarding): artifact ingest + classifier + suite-integration seams

Steps 3-4 of the onboarding plan, plus the sibling-product reconciliation seams.

Ingest (compliance-agent/src/ingest, #120):
- ingest_all / ingest_artifact normalize each artifact to a working path +
  metadata. Every blob is SHA-256 hashed (content-addressed store, dedup) —
  that digest is also the tramiton reconciliation key.
- git via GitOps reuse; zip archives + mobile packages extracted; firmware
  stored as blob; live URL / plaintext / container = metadata only.
- IngestContext decoupled from the full AgentConfig (testable in isolation).

Classify (compliance-agent/src/classify, #121):
- FirmwareDetector port + TramitonCli (shell out `tramiton detect --json`,
  parse a mirrored BuildPlan subset — no dependency on the proprietary crate)
  + a deterministic MockFirmwareDetector so CI never needs the binary.
- HeuristicClassifier: artifact-kind priors + source-marker fingerprinting
  (web/backend/mobile/desktop/PLC).
- classify_target merges + ranks verdicts into a Classification.

Suite-integration seams (compliance-core, #135/#136/#137):
- Model: ExternalRef/ExternalSystem (reconcile with tramiton/werkpilot/breakpilot),
  ComplianceProfile/ComplianceFramework + default_compliance_profile per type.
- Ports: EvidenceProvider (fetch external SBOM/VEX/lock/attestation) and
  ControlsProvider (built-in OSCAL vs breakpilot RAG).
- TargetType now derives Hash; AgentConfig gains artifact_store_base_path.

44 unit tests (23 core + 8 ingest + 13 classify). Passes fmt + clippy -D warnings
across agent, dashboard (server + web), and mcp. Additive; legacy paths untouched.

Refs #118, #120, #121, #135, #136, #137.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

compliance-agent/tests/common/mod.rs

@@ -44,6 +44,7 @@ impl TestServer {
             scan_schedule: String::new(),
             cve_monitor_schedule: String::new(),
             git_clone_base_path: "/tmp/compliance-scanner-tests/repos".into(),
+            artifact_store_base_path: "/tmp/compliance-scanner-tests/artifacts".into(),
             ssh_key_path: "/tmp/compliance-scanner-tests/ssh/id_ed25519".into(),
             github_token: None,
             github_webhook_secret: None,