preflight

Change-gated, branch-scoped lint preflight. It lints only the categories relevant to origin/<base>...HEAD, on changed paths only — not a whole-repo pnpm lint — then classifies each violation as introduced (on a line this branch added or changed) or pre-existing (already there, in a file the branch happens to touch).

This skill is the single source of truth for the preflight loop. It is invoked two ways:

• Standalone (/preflight) — a quick "will my branch pass scoped lint?" check, leaving any fixes in the working tree.
• Inside a ship flow (e.g. /send-it) — the lint gate that runs after commits and before the changelog/push steps.

All bundled scripts use only Node built-ins — no npm install, no build step. They operate on the consumer repo's root (run them from the repo root, where git resolves the branch diff).