v0.8.0 — smoke test: open the app in a real browser and look

Smoke test — open the app in a real browser and look. One new skill answers
"does the app run": it asks what to check, asks before it starts Docker and
Chrome, visits each page once and saves a picture of every one.

Added

• /pspt:smoke — offers the pages to check from the frontend router, the
  spec's screens and local HTML files (email previews), then asks once for
  permission to run Docker and Chrome for this run. It uses the app if it is
  already running, otherwise docker compose up -d --wait; logs in with a
  throwaway smoke+<time>@example.test user when a page needs it; visits each
  page once; and saves a full-page PNG of each. A page fails on an HTTP error,
  an uncaught JavaScript error, a failing or 5xx request to the app's API, a
  console error, a missing element or a login redirect — and the assistant
  reads every picture, so a blank page or a broken layout fails too. The test
  user is always deleted, and only what the skill started is stopped.
• references/smoke/smoke.mjs — the runner: Playwright from the project
  first, then a global install; Google Chrome first, then Playwright's
  Chromium. Writes the PNGs and report.json to .pspt-smoke/<run>/, which is
  excluded from git. Exit 0 pass, 1 fail, 2 no browser.

Limits, stated in every report

• Local only: never production or staging, never a migration outside the local
  container, never a deploy, never a real email or payment.
• Desktop Chrome only — not how Gmail or Outlook render an email, no
  email-client dark mode, no WebP handling of mail clients.
• One visit per page — a smoke test, not a test suite. Failures are offered as
  a /pspt:ticket; the skill never edits code.

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Full history: CHANGELOG.md