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>

website/src/content/docs/tools/alphaxiv.md

@@ -0,0 +1,40 @@
+---
+title: AlphaXiv
+description: Paper search and analysis tools
+section: Tools
+order: 1
+---
+
+## Overview
+
+AlphaXiv powers Feynman's academic paper workflows. All tools require an alphaXiv account — sign in with `feynman alpha login`.
+
+## Tools
+
+### alpha_search
+
+Paper discovery with three search modes:
+
+- **semantic** — Meaning-based search across paper content
+- **keyword** — Traditional keyword matching
+- **agentic** — AI-powered search that interprets your intent
+
+### alpha_get_paper
+
+Fetch a paper's report (structured summary) or full raw text by arXiv ID.
+
+### alpha_ask_paper
+
+Ask a targeted question about a specific paper. Returns an answer grounded in the paper's content.
+
+### alpha_annotate_paper
+
+Add persistent local notes to a paper. Annotations are stored locally and persist across sessions.
+
+### alpha_list_annotations
+
+Recall all annotations across papers and sessions.
+
+### alpha_read_code
+
+Read source code from a paper's linked GitHub repository. Useful for auditing or replication planning.