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>

skills/agentcomputer/references/cli-cheatsheet.md

@@ -0,0 +1,68 @@
+# CLI Cheatsheet
+
+## Authentication
+
+```bash
+computer whoami
+computer login
+computer claude-login     # install Claude credentials on a machine
+computer codex-login      # install Codex credentials on a machine
+```
+
+## Machine discovery
+
+```bash
+computer ls --json
+computer fleet status --json
+```
+
+## Agent discovery
+
+```bash
+computer agent agents <machine> --json
+```
+
+## Sessions
+
+```bash
+computer agent sessions list <machine> --json
+computer agent sessions new <machine> --agent claude --name research --json
+computer agent status <machine> --session <session_id> --json
+```
+
+## Prompting
+
+```bash
+computer agent prompt <machine> "run the experiment" --agent claude --name research
+computer agent prompt <machine> "continue" --session <session_id>
+```
+
+## Streaming and control
+
+```bash
+computer agent watch <machine> --session <session_id>
+computer agent cancel <machine> --session <session_id> --json
+computer agent interrupt <machine> --session <session_id> --json
+computer agent close <machine> --session <session_id>
+```
+
+## ACP bridge
+
+```bash
+computer acp serve <machine> --agent claude --name research
+```
+
+## Machine lifecycle
+
+```bash
+computer create my-box
+computer open my-box
+computer open my-box --terminal
+computer ssh my-box
+```
+
+## Good defaults
+
+- Prefer machine handles over machine ids when both are available.
+- Prefer `--name` for human-meaningful persistent sessions.
+- Prefer `--json` when another program or agent needs to read the result.