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/review.md

@@ -4,21 +4,8 @@ description: Simulate an AI research peer review with likely objections, severit
 Review this AI research artifact: $@
 
 Requirements:
-- Prefer the project `review` chain or the `researcher` + `verifier` + `reviewer` subagents when the artifact is large or the review needs to inspect paper, code, and experiments together.
-- Inspect the strongest relevant sources directly before making strong review claims.
-- If the artifact is a paper or draft, evaluate:
-  - novelty and related-work positioning
-  - clarity of claims
-  - baseline fairness
-  - evaluation design
-  - missing ablations
-  - reproducibility details
-  - whether conclusions outrun the evidence
-- If code or experiment artifacts exist, compare them against the claimed method and evaluation.
-- Produce:
-  - short verdict
-  - likely reviewer objections
-  - severity for each issue
-  - revision plan in priority order
+- Spawn a `researcher` subagent to gather evidence on the artifact — inspect the paper, code, cited work, and any linked experimental artifacts. Save to `research.md`.
+- Spawn a `reviewer` subagent with `research.md` to produce the final peer review with inline annotations.
+- For small or simple artifacts where evidence gathering is overkill, run the `reviewer` subagent directly instead.
 - Save exactly one review artifact to `outputs/` as markdown.
 - End with a `Sources` section containing direct URLs for every inspected external source.