Add Authority Advisory AI and API Lifecycle Configuration

- Introduced AuthorityAdvisoryAiOptions and related classes for managing advisory AI configurations, including remote inference options and tenant-specific settings.
- Added AuthorityApiLifecycleOptions to control API lifecycle settings, including legacy OAuth endpoint configurations.
- Implemented validation and normalization methods for both advisory AI and API lifecycle options to ensure proper configuration.
- Created AuthorityNotificationsOptions and its related classes for managing notification settings, including ack tokens, webhooks, and escalation options.
- Developed IssuerDirectoryClient and related models for interacting with the issuer directory service, including caching mechanisms and HTTP client configurations.
- Added support for dependency injection through ServiceCollectionExtensions for the Issuer Directory Client.
- Updated project file to include necessary package references for the new Issuer Directory Client library.

docs/modules/excititor/architecture.md

@@ -107,7 +107,9 @@ Excititor derives `vex_normalized` tuples (without making decisions) for downstr
 }
 ```
 
-These tuples allow VEX Lens to compute deterministic consensus without re-parsing heavy upstream documents.
+These tuples allow VEX Lens to compute deterministic consensus without re-parsing heavy upstream documents.
+
+Excititor workers now hydrate signature metadata with issuer trust data retrieved from the Issuer Directory service. The worker-side IssuerDirectoryClient performs tenant-aware lookups (including global fallbacks) and caches responses offline so attestation verification exposes an effective trust weight alongside the cryptographic details captured on ingest.
 
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