Add channel test providers for Email, Slack, Teams, and Webhook

- Implemented EmailChannelTestProvider to generate email preview payloads.
- Implemented SlackChannelTestProvider to create Slack message previews.
- Implemented TeamsChannelTestProvider for generating Teams Adaptive Card previews.
- Implemented WebhookChannelTestProvider to create webhook payloads.
- Added INotifyChannelTestProvider interface for channel-specific preview generation.
- Created ChannelTestPreviewContracts for request and response models.
- Developed NotifyChannelTestService to handle test send requests and generate previews.
- Added rate limit policies for test sends and delivery history.
- Implemented unit tests for service registration and binding.
- Updated project files to include necessary dependencies and configurations.

docs/09_API_CLI_REFERENCE.md

@@ -522,10 +522,12 @@ See `docs/dev/32_AUTH_CLIENT_GUIDE.md` for recommended profiles (online vs. air-
 | `stellaops-cli auth revoke export` | Export the Authority revocation bundle | `--output <directory>` (defaults to CWD) | Writes `revocation-bundle.json`, `.json.jws`, and `.json.sha256`; verifies the digest locally and includes key metadata in the log summary. |
 | `stellaops-cli auth revoke verify` | Validate a revocation bundle offline | `--bundle <path>` `--signature <path>` `--key <path>`<br>`--verbose` | Verifies detached JWS signatures, reports the computed SHA-256, and can fall back to cached JWKS when `--key` is omitted. |
 | `stellaops-cli config show` | Display resolved configuration | — | Masks secret values; helpful for air‑gapped installs |
-| `stellaops-cli runtime policy test` | Ask Scanner.WebService for runtime verdicts (Webhook parity) | `--image/-i <digest>` (repeatable, comma/space lists supported)<br>`--file/-f <path>`<br>`--namespace/--ns <name>`<br>`--label/-l key=value` (repeatable)<br>`--json` | Posts to `POST /api/v1/scanner/policy/runtime`, deduplicates image digests, and prints TTL + per-image verdict/signed/SBOM status. Accepts newline/whitespace-delimited stdin when piped; `--json` emits the raw response without additional logging. |
+| `stellaops-cli runtime policy test` | Ask Scanner.WebService for runtime verdicts (Webhook parity) | `--image/-i <digest>` (repeatable, comma/space lists supported)<br>`--file/-f <path>`<br>`--namespace/--ns <name>`<br>`--label/-l key=value` (repeatable)<br>`--json` | Posts to `POST /api/v1/scanner/policy/runtime`, deduplicates image digests, and prints TTL/policy revision plus per-image columns for signed state, SBOM referrers, quieted-by metadata, confidence, and Rekor attestation (uuid + verified flag). Accepts newline/whitespace-delimited stdin when piped; `--json` emits the raw response without additional logging. |
 
 When running on an interactive terminal without explicit override flags, the CLI uses Spectre.Console prompts to let you choose per-run ORAS/offline bundle behaviour.
 
+Runtime verdict output reflects the SCANNER-RUNTIME-12-302 contract sign-off (quieted provenance, confidence band, attestation verification). CLI-RUNTIME-13-008 now mirrors those fields in both table and `--json` formats.
+
 **Startup diagnostics**
 
 - `stellaops-cli` now loads Authority plug-in manifests during startup (respecting `Authority:Plugins:*`) and surfaces analyzer warnings when a plug-in weakens the baseline password policy (minimum length **12** and all character classes required).