REQ-011 covers direct nav to both /zeitstrahl/events/new and
/{id}/edit, but the row cited only the /new guard + test. The
[id]/edit route shares the same requireWriteAll helper and already
carries its own 403 gating test (shipped with #781); cite both so the
traceability matches the requirement. Closes the Tester/Security
review note (no new test needed — the guard test already exists).
Refs #842
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>