docs(02): create calendar-display phase plan (5 plans, 4 waves)

.planning/ROADMAP.md

@@ -58,7 +58,15 @@ Plans:
   3. A recurring event (e.g., weekly meeting) displays all its occurrences correctly in the current view window, including correct behavior across DST boundaries
   4. All-day events (birthdays, holidays) appear as full-day banners on the correct date with no timezone shift
 
-**Plans**: TBD
+**Plans**: 5 plans
+Plans:
+
+- [ ] 02-01-PLAN.md — Foundation: schema (hasRrule + calendars.isShared, pushed) + dev-auth bypass + PWA vitest/jsdom harness + ICS fixtures + RED test stubs
+- [ ] 02-02-PLAN.md — Backend slice: expandOccurrences() (VTIMEZONE/DST + all-day + EXDATE) + windowed/joined/zod-validated /api/events + shared-calendar checkpoint (CAL-02/CAL-07)
+- [ ] 02-03-PLAN.md — Frontend foundation: CSS token layer + colorUtils + calendarConfig (firstDayOfWeek 0→7) + hydrateEvents (Temporal/PlainDate guard) + Zustand store + windowed fetchEvents
+- [ ] 02-04-PLAN.md — Vertical slice: CalendarShell mounts Schedule-X, renders real windowed Fastmail events color-coded across all four views (CAL-02/CAL-03)
+- [ ] 02-05-PLAN.md — UX completion: read-only EventDetailPopover + ColorLegend + nav/toolbar + skeleton/empty/error states + human visual verification
+
 **UI hint**: yes
 
 ### Phase 3: Event Write-Back + PWA Install