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>

prompts/lit.md

@@ -5,12 +5,7 @@ Investigate the following topic as a literature review: $@
 
 Requirements:
 - Use the `researcher` subagent when the sweep is wide enough to benefit from delegated paper triage before synthesis.
-- If the topic is academic or paper-centric, use `alpha_search` first.
-- If the topic is current, product-oriented, market-facing, or asks about latest developments, use `web_search` and `fetch_content` first, then use `alpha_search` only for academic background.
-- Use `alpha_get_paper` on the most relevant papers before making strong claims.
-- Use `alpha_ask_paper` for targeted follow-up questions when the report is not enough.
-- Prefer primary sources and note when something appears to be a preprint or secondary summary.
 - Separate consensus, disagreements, and open questions.
 - When useful, propose concrete next experiments or follow-up reading.
-- End with a `Sources` section containing direct URLs for every paper or source used.
-- If the user wants an artifact, write exactly one review to disk as markdown.
+- Save exactly one literature review to `outputs/` as markdown.
+- End with a `Sources` section containing direct URLs for every source used.