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/modules/graph/observability/SHA256SUMS

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+# Hash index for graph observability exports

docs/modules/graph/prep/2025-12-05-ops-demo-placeholder.md

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+# Graph Ops Demo Placeholder (2025-12-05)
+
+Waiting on next demo outputs to move GRAPH-OPS-0001 from TODO. This file reserves path and determinism checklist.
+
+## Pending inputs
+- Latest demo run metrics and dashboards (JSON export)
+- Runbook updates (alerts, SLOs) based on demo
+- Hashes of exported dashboards/runbook files
+
+## Determinism checklist
+- Store dashboard export JSON under `docs/modules/graph/observability/` with SHA256 in `docs/modules/graph/observability/SHA256SUMS`.
+- Document any new runbook steps with UTC timestamps and stable ordering.