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/cli/src/ui/commands/experimentCommand.test.ts

@@ -18,6 +18,7 @@ describe('experimentCommand', () => {
       services: {
         config: {
           getExperimentValue: vi.fn(),
+          updateExperimentalSettings: vi.fn(),
         },
         settings: {
           merged: {

packages/cli/src/ui/commands/experimentCommand.ts

@@ -107,13 +107,16 @@ const setExperimentCommand: SlashCommand = {
       value = rawValue;
     }
 
-    const { settings } = context.services;
+    const { settings, config } = context.services;
+    if (!config) return;
+
     const currentExperimental = {
       ...((settings.merged.experimental as Record<string, unknown>) || {}),
     };
     currentExperimental[name] = value;
 
     settings.setValue(SettingScope.User, 'experimental', currentExperimental);
+    config.updateExperimentalSettings(currentExperimental);
 
     context.ui.addItem({
       type: MessageType.INFO,
@@ -138,7 +141,9 @@ const unsetExperimentCommand: SlashCommand = {
       return;
     }
 
-    const { settings } = context.services;
+    const { settings, config } = context.services;
+    if (!config) return;
+
     const currentExperimental = {
       ...((settings.merged.experimental as Record<string, unknown>) || {}),
     };
@@ -153,6 +158,7 @@ const unsetExperimentCommand: SlashCommand = {
 
     delete currentExperimental[name];
     settings.setValue(SettingScope.User, 'experimental', currentExperimental);
+    config.updateExperimentalSettings(currentExperimental);
 
     context.ui.addItem({
       type: MessageType.INFO,