Overhaul Feynman harness: streamline agents, prompts, and extensions

Remove legacy chains, skills, and config modules. Add citation agent,
SYSTEM.md, modular research-tools extension, and web-access layer.
Add ralph-wiggum to Pi package stack for long-running loops.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/web-search.ts

@@ -1,19 +1,9 @@
 export {
-	FEYNMAN_CONFIG_PATH as WEB_SEARCH_CONFIG_PATH,
-	WEB_SEARCH_PROVIDERS,
-	configureWebSearchProvider,
-	formatWebSearchDoctorLines,
-	getConfiguredWebSearchProvider,
-	getWebSearchProviderById,
-	getWebSearchStatus,
-	hasConfiguredWebProvider,
-	hasGeminiApiKey,
-	hasPerplexityApiKey,
-	loadWebSearchConfig,
-	saveWebSearchConfig,
+	formatPiWebAccessDoctorLines,
+	getPiWebAccessStatus,
+	getPiWebSearchConfigPath,
+	loadPiWebAccessConfig,
+	type PiWebAccessConfig,
+	type PiWebAccessStatus,
 	type PiWebSearchProvider,
-	type WebSearchConfig,
-	type WebSearchProviderDefinition,
-	type WebSearchProviderId,
-	type WebSearchStatus,
-} from "./config/feynman-config.js";
+} from "./pi/web-access.js";