feat: TypeScript telemetry client SDK v0.1.0

Standalone npm package (@mosaicstack/telemetry-client) for reporting
task-completion telemetry and querying predictions from the Mosaic
Stack Telemetry server.

- TelemetryClient with setInterval-based background flush
- EventQueue (bounded FIFO array)
- BatchSubmitter with native fetch, exponential backoff, Retry-After
- PredictionCache (Map + TTL)
- EventBuilder with auto-generated event_id/timestamp
- Zero runtime dependencies (Node 18+ native APIs)
- 43 tests, 86% branch coverage

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/types/common.ts

@@ -0,0 +1,26 @@
+import { TaskCompletionEvent } from './events.js';
+import { PredictionQuery, PredictionResponse } from './predictions.js';
+
+export interface BatchEventRequest {
+  events: TaskCompletionEvent[];
+}
+
+export interface BatchEventResult {
+  event_id: string;
+  status: 'accepted' | 'rejected';
+  error?: string | null;
+}
+
+export interface BatchEventResponse {
+  accepted: number;
+  rejected: number;
+  results: BatchEventResult[];
+}
+
+export interface BatchPredictionRequest {
+  queries: PredictionQuery[];
+}
+
+export interface BatchPredictionResponse {
+  results: PredictionResponse[];
+}