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/workflows/compare.md

@@ -0,0 +1,29 @@
+---
+title: Source Comparison
+description: Compare multiple sources with agreement/disagreement matrix
+section: Workflows
+order: 6
+---
+
+## Usage
+
+```
+/compare <topic>
+```
+
+## What it does
+
+Compares multiple sources on a topic. Builds an agreement/disagreement matrix showing where sources align and where they conflict.
+
+## Example
+
+```
+/compare approaches to constitutional AI training
+```
+
+## Output
+
+- Source-by-source breakdown
+- Agreement/disagreement matrix
+- Synthesis of key differences
+- Assessment of which positions have stronger evidence