docs: correct rrule drift (code uses ical.js RecurExpansion) + minor fixes

Recurrence expansion uses ical.js ICAL.RecurExpansion, not the rrule
library (never installed/imported). Also fix playwright-cli path
(/usr/bin), prod-compose service count (two, post-Redis-removal), and
CI job count (six). Found via /gsd-docs-update --verify-only.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/DEVELOPMENT.md

@@ -203,7 +203,7 @@ Every PR to `main` runs through `.gitea/workflows/ci.yml`. A `changes` path-filt
 | `security`    | Every PR             | Gitleaks secret scan (PR diff); `pnpm audit` (High+Critical blocking) + outdated report on code-change PRs   |
 | `gate`        | Always               | Final aggregator — requires `fast-checks` and `security` to succeed; `api` and `harness` may be skipped      |
 
-All five jobs must pass (or be legitimately skipped) before a PR can merge. See [docs/TESTING.md](TESTING.md) for test suite details.
+All six jobs must pass (or be legitimately skipped) before a PR can merge. See [docs/TESTING.md](TESTING.md) for test suite details.
 
 ### CI dependency caches