Interface CvdiagPbWriter

showcase/harness/src/cvdiag/emit.ts:139–142

 * injected dependency. There is NO PB client implemented in L0-A.
 */
export interface CvdiagPbWriter {
  /** Best-effort CREATE of a batch of envelopes. Resolves; never rejects. */
  writeBatch(events: CvdiagEnvelope[]): Promise<void>;
}

/** Env bag the emitter reads for tier resolution (injectable for tests). */
export type CvdiagEnv = Record<string, string | undefined>;