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/configuration.md

@@ -0,0 +1,66 @@
+---
+title: Configuration
+description: Configure models, search, and runtime options
+section: Getting Started
+order: 4
+---
+
+## Model
+
+Set the default model:
+
+```bash
+feynman model set <provider:model>
+```
+
+Override at runtime:
+
+```bash
+feynman --model anthropic:claude-opus-4-6
+```
+
+List available models:
+
+```bash
+feynman model list
+```
+
+## Thinking level
+
+Control the reasoning depth:
+
+```bash
+feynman --thinking high
+```
+
+Levels: `off`, `minimal`, `low`, `medium`, `high`, `xhigh`.
+
+## Web search
+
+Check the current search configuration:
+
+```bash
+feynman search status
+```
+
+For advanced configuration, edit `~/.feynman/web-search.json` directly to set Gemini API keys, Perplexity keys, or a different route.
+
+## Working directory
+
+```bash
+feynman --cwd /path/to/project
+```
+
+## Session storage
+
+```bash
+feynman --session-dir /path/to/sessions
+```
+
+## One-shot mode
+
+Run a single prompt and exit:
+
+```bash
+feynman --prompt "summarize the key findings of 2401.12345"
+```