feat(cli): add vibeprompt CLI and interactive TUI (closes #19)

[LyraCS]

What

Adds a cli/ package to vibeprompt: a terminal tool to browse, search, show, copy, and view prompts without leaving the terminal. Closes #19.

Commands

vibeprompt                       # alias for browse
vibeprompt browse                # list all categories with prompt counts
vibeprompt browse "Agent Setup"  # list prompts in a category
vibeprompt search "tdd"          # full-text search across all prompts
vibeprompt show <slug|title>     # print a prompt to stdout
vibeprompt copy <slug|title>     # copy a prompt to the clipboard
vibeprompt workflow              # show the 9-step playbook
vibeprompt tui                   # interactive split-pane terminal UI

The TUI (built with Ink, React-in-terminal) has split panes: prompts on the left, detail on the right. Arrow keys move, Enter opens a prompt, s searches, c cycles categories, Esc backs out or quits.

How it works

• Reads prompts directly from prompt-library/ (the fully-offline option raised in the issue). Finds the folder by walking up from cwd, or via VIBEPROMPT_ROOT.
• Slugs match the web app format (agent-setup-agents-md-generator).
• Built with tsup, bundled ESM, ships a vibeprompt bin.

Notes / open questions from the issue

• Name: kept vibeprompt. Aliases b, s, w added; happy to add vibe as a shorter alias.
• Offline vs live: implemented fully offline (bundle reads the local prompt-library/). Swapping to live fetch later means changing loadLibrary() only.
• PageLens scan: not wired. It lives in the web app (/scan, 40+ rules). Left as a stub pointing to the site; wiring it means either shipping the audit logic in Node or hitting a public endpoint, both need a decision.
• brew install: out of scope here; needs a separate homebrew tap repo after publishing.

Tests

npm test in cli/ runs the node test runner against the built CLI (browse/search/show/workflow) and renders the TUI via ink-testing-library. 5 tests pass.

Typecheck

npm run typecheck in cli/ passes. The CLI is excluded from the root Next.js tsconfig and eslint so the web app build is unaffected.

Generated with AI assistance (Claude/opencode); reviewed by a human before opening.

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[dotsystemsdevs]

Thanks @LyraCS, merged! Heads up: the project is being renamed to Pineflow and moving under Stackpine, so the CLI name may change later. Really appreciate this 🙌