Fix npm run build failing with missing api/client module errors - #2

npm run build (and npm test, npm run check-types, npm start) fails on a fresh clone with Cannot find module '../api/client/**'. The generated API client (src/api/client/) is gitignored and only materializes after manually running npm run update-api, which nothing enforces before these scripts run.

Fix

• Added an ensure-api-client script (test -d ./src/api/client || npm run update-api) that generates the client only when missing
• Wired it as a pre* hook on build, test, check-types, and start so those scripts self-heal on a fresh clone
• No-op when src/api/client/ already exists, so CI (which already runs update-api explicitly) makes no extra network call

Docs

• Updated SPECS/setup.md and AGENTS.md quick reference to document the auto-bootstrap behavior
• Added changelog entry in SPECS/README.md and a changeset

"scripts": {
  "ensure-api-client": "test -d ./src/api/client || npm run update-api",
  "prebuild": "npm run ensure-api-client",
  "pretest": "npm run ensure-api-client",
  "precheck-types": "npm run ensure-api-client",
  "prestart": "npm run ensure-api-client"
}