Add .DS_Store to .gitignore and untrack the two committed copies
(.DS_Store at the root and .claude/.DS_Store). macOS noise that
shouldn't have been versioned in the first place.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Captures the agreed design for Stripe webhook handling, 5-day grace
period with branded day-3/day-5 reminders, and Stripe Customer Portal
as the single subscription-management surface. Updates payments rules
to match and ignores .worktrees/ for isolated implementation work.
