feat(wake): probe 4 times per marked hour (:00 :15 :30 :45), coalesce same-tick fires

Marking an hour on the Claude Wake Schedule panel now schedules FOUR probes
within that hour instead of one. Rate-window edges are unforgiving — a
single probe at :15 can miss the actual reset moment by up to 14 minutes;
hitting :00 / :15 / :30 / :45 puts us within ~7 minutes of any reset that
happens during that hour.

When multiple slots come due in the same 30s scheduler tick (or recover
together at boot), they coalesce into a SINGLE upstream wake call — no
point hitting Anthropic 4× in the same window.

DB schema
- wake_schedule is now (hour, slot_minute, next_wake_at) PK (hour,
  slot_minute). Destructive migration: detect old single-row-per-hour
  schema by absence of the slot_minute column and DROP TABLE. No other
  table is touched. Per user direction: no back-compat for old rows.

API
- POST /models/wake-schedule/toggle add: { hour, timestamps: { '0': ms,
  '15': ms, '30': ms, '45': ms } } — all 4 slots required, all must be
  future Unix ms. Delete shape unchanged ({ hour }).
- GET /models/wake-schedule shape:
    schedule: { '9': { '0': ts, '15': ts, '30': ts, '45': ts }, ... }
    probeSlotMinutes: [0, 15, 30, 45]
    resetOffsetHours, lastWake, pendingRetry  (unchanged from prior commit)

Frontend
- Computes 4 timestamps client-side (next occurrence of HH:MM in local TZ)
  and sends them in one request.
- markedHours summary now says 'Probes :00 :15 :30 :45 → reset by ~Xh later'.
- Same in-flight tracking / current-hour ring / status row as before.

Tests
- wake-scheduler.test.ts unchanged (pure helpers still correct; added
  PROBE_SLOT_MINUTES + isProbeSlotMinute exports).
- routes.test.ts rewritten for the new payload shape: 12 wake-schedule
  tests covering snapshot shape, add/remove (full 4-slot round-trip),
  validation (range, integer, past-slot, missing slot, non-object,
  missing timestamps), independent multi-hour scheduling, and
  re-toggle replacement. 417 tests total (was 414).

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