fix(crypto,sleep): register the ECG column for rotation and update the sleep-debt route test

The canonical rotation registry (src/lib/crypto/encrypted-columns.ts) is the
source of truth its guard test cross-checks; add EcgRecording.waveformEncrypted
there (the script already references it) and drop the redundant parallel guard.
Update the sleep/rhythm route test to the v1.19.0 rolling 5-night balance
(nightsCounted 5, debt 300) instead of the old 14-night cumulative sum.

src/lib/crypto/encrypted-columns.ts

@@ -128,6 +128,9 @@ export const ENCRYPTED_COLUMNS: readonly EncryptedColumn[] = [
   { model: "Biomarker", field: "contextEncrypted", kind: "bytes" },
   { model: "IllnessEpisode", field: "noteEncrypted", kind: "bytes" },
   { model: "IllnessDayLog", field: "noteEncrypted", kind: "bytes" },
+
+  // ───── v1.19.0 ECG waveform (Bytes column) ─────
+  { model: "EcgRecording", field: "waveformEncrypted", kind: "bytes" },
 ] as const;
 
 /** Stable `Model.field` key for a registry entry. */