chore: vendor impeccable design skill for claude code

[yigitdot]

What

Adds Impeccable (v0.1.5 engine), installed with npx impeccable install --providers=claude --scope=project:

• .claude/skills/impeccable/: the /impeccable skill (24 design commands such as init, audit, critique, polish) plus its launcher and live-browser scripts
• .claude/agents/impeccable-*.md: 4 subagents the skill hands work to

Why

This gives every Claude Code session in the repo the same design vocabulary and anti-pattern checks for the site's frontend, with no per-person global install.

Reviewer notes

• Engine binary is gitignored. .claude/skills/impeccable/scripts/bin/ holds a 12 MB platform-specific binary. The launcher downloads it into ~/.impeccable/bin/ on first run when it's missing, so it stays out of git.
• Vendored files are left verbatim. They are excluded from Prettier (.prettierignore) and ESLint (eslint.config.mjs), so lint-staged and CI don't reformat third-party output. A fresh npx impeccable install reproduces the committed files byte for byte (checked with diff -r). Refresh them with npx impeccable update.
• Hooks are not shared. The installer writes its PostToolUse/Stop detector hooks to .claude/settings.local.json, which is gitignored, so this PR doesn't include them. Anyone who wants the hooks can re-run the installer locally. We could also move them into the tracked .claude/settings.json in a follow-up.
• Next step after merge: run /impeccable init to generate PRODUCT.md.

pnpm format:check and pnpm lint pass.

🤖 Generated with Claude Code

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