Add unit tests for Router configuration and transport layers

- Implemented tests for RouterConfig, RoutingOptions, StaticInstanceConfig, and RouterConfigOptions to ensure default values are set correctly.
- Added tests for RouterConfigProvider to validate configurations and ensure defaults are returned when no file is specified.
- Created tests for ConfigValidationResult to check success and error scenarios.
- Developed tests for ServiceCollectionExtensions to verify service registration for RouterConfig.
- Introduced UdpTransportTests to validate serialization, connection, request-response, and error handling in UDP transport.
- Added scripts for signing authority gaps and hashing DevPortal SDK snippets.

docs/db/README.md

@@ -38,10 +38,16 @@ Schema DDL files (generated from specifications):
 | vuln | [schemas/vuln.sql](./schemas/vuln.sql) | 12 |
 | vex | [schemas/vex.sql](./schemas/vex.sql) | 13 |
 | scheduler | [schemas/scheduler.sql](./schemas/scheduler.sql) | 10 |
-| notify | [schemas/notify.sql](./schemas/notify.sql) | 14 |
+| notify | [schemas/notify.sql](./schemas/notify.sql) | 17 |
 | policy | [schemas/policy.sql](./schemas/policy.sql) | 8 |
+| packs | Included in policy schema | — |
+| issuer | [schemas/issuer.sql](./schemas/issuer.sql) | PROPOSED |
+| audit (shared) | [schemas/audit.sql](./schemas/audit.sql) | PROPOSED |
 
-Pending DDL exports (per SPECIFICATION.md §§2.2 & 5): `packs.sql`, `issuer.sql`, and shared `audit.sql`.
+Notes:
+- Authority, vuln, vex, scheduler DDLs have been exported from SPECIFICATION.md. Notify, policy, packs, issuer, and audit remain to be exported (placeholders present).
+- Persistence configuration template: `docs/db/persistence-config-template.yaml` (replace hosts/creds per environment).
+- Cluster provisioning inputs template: `docs/db/cluster-provisioning.md`.
 
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