feat(telemetry): add telemetry client and services for tracking events

- Implemented TelemetryClient to handle event queuing and flushing to the telemetry endpoint.
- Created TtfsTelemetryService for emitting specific telemetry events related to TTFS.
- Added tests for TelemetryClient to ensure event queuing and flushing functionality.
- Introduced models for reachability drift detection, including DriftResult and DriftedSink.
- Developed DriftApiService for interacting with the drift detection API.
- Updated FirstSignalCardComponent to emit telemetry events on signal appearance.
- Enhanced localization support for first signal component with i18n strings.

src/Cli/StellaOps.Cli/TASKS.md

@@ -7,5 +7,5 @@
 | `CLI-AIAI-31-002` | DONE (2025-11-24) | `stella advise explain` (conflict narrative) command implemented and tested. |
 | `CLI-AIAI-31-003` | DONE (2025-11-24) | `stella advise remediate` command implemented and tested. |
 | `CLI-AIAI-31-004` | DONE (2025-11-24) | `stella advise batch` supports multi-key runs, per-key outputs, summary table, and tests (`HandleAdviseBatchAsync_RunsAllAdvisories`). |
-| `CLI-AIRGAP-339-001` | DONE (2025-12-15) | Implemented `stella offline import/status` (DSSE verify, monotonicity + quarantine hooks, state storage), plus tests and docs; Rekor inclusion proof verification and `verify offline` policy remain blocked pending contracts. |
+| `CLI-AIRGAP-339-001` | DONE (2025-12-18) | Implemented `stella offline import/status` (DSSE + Rekor verification, monotonicity + quarantine hooks, state storage) and `stella verify offline` (YAML/JSON policy loader, deterministic evidence reconciliation); tests passing. |
 | `CLI-AIRGAP-341-001` | DONE (2025-12-15) | Sprint 0341: Offline Kit reason/error codes and ProblemDetails integration shipped; tests passing. |