feat(FN-3637): establish canonical roadmap plugin ID and compatibility rout

Merged commits stabilize the Fusion roadmap plugin's identity and routing surface, establishing a canonical plugin ID and compatibility routes so the roadmap plugin integrates cleanly with the dashboard's plugin system. Added new roadmap-routes and roadmap-suggestions modules in the dashboard packag

Fusion-Task-Id: FN-3637

packages/dashboard/src/roadmap-suggestions.ts

@@ -0,0 +1,15 @@
+export {
+  FEATURE_SUGGESTION_SYSTEM_PROMPT,
+  MILESTONE_SUGGESTION_SYSTEM_PROMPT,
+  ParseError,
+  ServiceUnavailableError,
+  SUGGESTION_TIMEOUT_MS,
+  ValidationError,
+  __resetSuggestionState,
+  __setCreateAiSessionFactory,
+  __setCreateFnAgent,
+  generateFeatureSuggestions,
+  generateMilestoneSuggestions,
+  validateFeatureSuggestionInput,
+  validateSuggestionInput,
+} from "@fusion-plugin-examples/roadmap/roadmap-suggestions";