refactor(config): stabilize synchronous experiment access and add real-time updates

- Revert getExperimentValue to a synchronous interface to maintain compatibility with existing callers.
- Add Config.updateExperimentalSettings() to support immediate application of /experiment set/unset changes.
- Implement CLI argument normalization to handle kebab-case, camelCase, and snake_case consistently.
- Enhance getExperimentFlagIdFromName to be more resilient to different naming conventions.
- Rename getNumericalRoutingEnabled to isNumericalRoutingEnabled for better idiomatic consistency.
- Update documentation in experimentation skill to recommend strongly-typed wrappers in Config.ts.
- Add regression tests for CLI overrides and update all relevant routing and command tests.
- Fix lint errors by removing unnecessary await/Promise.all for synchronous config methods.

packages/core/src/routing/modelRouterService.ts

@@ -76,10 +76,8 @@ export class ModelRouterService {
     const startTime = Date.now();
     let decision: RoutingDecision;
 
-    const [enableNumericalRouting, thresholdValue] = await Promise.all([
-      this.config.getNumericalRoutingEnabled(),
-      this.config.getResolvedClassifierThreshold(),
-    ]);
+    const enableNumericalRouting = this.config.isNumericalRoutingEnabled();
+    const thresholdValue = this.config.getResolvedClassifierThreshold();
     const classifierThreshold = String(thresholdValue);
 
     let failed = false;