Rename .pi to .feynman, rename citation agent to verifier, add website, skills, and docs

- Rename project config dir from .pi/ to .feynman/ (Pi supports this via piConfig.configDir)
- Rename citation agent to verifier across all prompts, agents, skills, and docs
- Add website with homepage and 24 doc pages (Astro + Tailwind)
- Add skills for all workflows (deep-research, lit, review, audit, replicate, compare, draft, autoresearch, watch, jobs, session-log, agentcomputer)
- Add Pi-native prompt frontmatter (args, section, topLevelCli) and read at runtime
- Remove sync-docs generation layer — docs are standalone
- Remove metadata/prompts.mjs and metadata/packages.mjs — not needed at runtime
- Rewrite README and homepage copy
- Add environment selection to /replicate before executing
- Add prompts/delegate.md and AGENTS.md

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

prompts/compare.md

@@ -1,10 +1,13 @@
 ---
 description: Compare multiple sources on a topic and produce a source-grounded matrix of agreements, disagreements, and confidence.
+args: <topic>
+section: Research Workflows
+topLevelCli: true
 ---
 Compare sources for: $@
 
 Requirements:
-- Use the `researcher` subagent to gather source material when the comparison set is broad, and the `citation` subagent to verify sources and add inline citations to the final matrix.
+- Use the `researcher` subagent to gather source material when the comparison set is broad, and the `verifier` subagent to verify sources and add inline citations to the final matrix.
 - Build a comparison matrix covering: source, key claim, evidence type, caveats, confidence.
 - Distinguish agreement, disagreement, and uncertainty clearly.
 - Save exactly one comparison to `outputs/` as markdown.