v0.9.1 — legible green status text

Highlights

• Small green status text is legible again in light mode. Labels like "OK · served",
  the Topbar Live chip, provider status, free-price and free-spend markers, invite
  "accepted" and budget "enabled" shared the same green as the status dots — 2.7:1
  against white, below the WCAG AA 4.5:1 floor for text. They now use a darkened green
  (5.4:1 on panels, 4.8:1 on the green chip background). Dots, bars and chip fills keep
  the original colour, so the only visible change is that the text is readable. Dark mode
  already passed at 8.1:1 and is untouched.

Also in this release: the self-host installer's idempotency test passes again (its stub
had not kept up with the installer's safer download-then-extract behaviour), and CI now
documents that the skip-ci token is honoured in commit bodies as well as subjects — the
cause of two missed CI runs around v0.9.0. Both are repo hygiene with no runtime effect,
but they are why v0.9.0's tag build could not go green and this one does.

Upgrade notes

• Nothing to do — no migrations, no config, no behaviour change beyond the colour of
  small green labels. A drop-in upgrade from 0.9.0.
• Everything in the v0.9.0 notes
  still applies if you are coming from 0.8.x — in particular, do not buffer
  /api/events if you front polyrouter with a reverse proxy.

Full package changelogs live in packages/*/CHANGELOG.md.