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/getting-started/installation.md

@@ -0,0 +1,34 @@
+---
+title: Installation
+description: Install Feynman and get started
+section: Getting Started
+order: 1
+---
+
+## Requirements
+
+- Node.js 20 or later
+- npm 9 or later
+
+## Install
+
+```bash
+npm install -g @companion-ai/feynman
+```
+
+## Verify
+
+```bash
+feynman --version
+```
+
+## Local Development
+
+For contributing or local development:
+
+```bash
+git clone https://github.com/getcompanion-ai/feynman.git
+cd feynman
+npm install
+npm run start
+```