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/governance/SHA256SUMS

@@ -0,0 +1,9 @@
+# Hash index for governance/exception docs
+# <sha256>  <relative-path>
+8a5d1429a307eff95d86476e330defb381bc447239e569bea8c2b641db72ff98  docs/governance/exceptions.md
+bc91b827793ea36a079b0f68de102424034f539d497f50fa90cb8a6c4da4dec4  docs/governance/approvals-and-routing.md
+ec33d6612473d997196ec463042cc5cff21e107ab9d267fd2fa4ffd166e6f25c  docs/api/exceptions.md
+147b79a89bc3c0561f070e843bc9aeb693f12bea287c002073b5f94fc7389c5f  docs/ui/exception-center.md
+9967d66765f90a31e16d354e43dd6952566d3a359e3250f4f5f9d4b206ba1686  docs/modules/cli/guides/exceptions.md
+8a5d1429a307eff95d86476e330defb381bc447239e569bea8c2b641db72ff98  docs/governance/exceptions.md
+bc91b827793ea36a079b0f68de102424034f539d497f50fa90cb8a6c4da4dec4  docs/governance/approvals-and-routing.md

docs/governance/approvals-and-routing.md

@@ -0,0 +1,15 @@
+# Approvals & Routing (stub)
+
+> Status: BLOCKED — awaiting routing matrix, MFA rules, audit trail requirements (DOCS-EXC-25-002).
+
+## Outline
+1. Roles and approvers (matrix TBD)
+2. Routing rules per tenant/environment/resource
+3. MFA requirements and enforcement points
+4. Audit trail fields and retention
+5. Offline readiness (export/import of approvals)
+6. Verification steps (hash list + sample events)
+
+## Determinism
+- Add hashes to `docs/governance/SHA256SUMS` when populated.
+- Keep tables sorted by role/tenant/environment to minimize churn.

docs/governance/exceptions.md

@@ -0,0 +1,24 @@
+# Exception Governance (stub)
+
+> Status: BLOCKED — awaiting lifecycle/routing matrix and API contract from Governance/Authority/Platform guilds. This stub sets structure and determinism requirements for DOCS-EXC-25-001.
+
+## Scope
+- Exception lifecycle, scope patterns, compliance checklist.
+- Deterministic artifacts for offline/air-gap use.
+
+## Pending inputs
+- Final lifecycle states and transitions.
+- Scope pattern examples (tenant/env/service/resource).
+- Compliance checklist from Governance Guild.
+
+## Outline
+1. Imposed rule banner (to be filled)
+2. Exception lifecycle (states, transitions, allowed actors)
+3. Scope patterns and examples
+4. Compliance checklist
+5. Offline/air-gap packaging notes
+6. Verification (hash + replay of fixtures)
+
+## Determinism
+- When content is added, record hashes in `docs/governance/SHA256SUMS`.
+- Use UTC timestamps and stable ordering of tables.