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/index.ts

@@ -0,0 +1,28 @@
+export {
+  TaskType,
+  Complexity,
+  Harness,
+  Provider,
+  QualityGate,
+  Outcome,
+  RepoSizeCategory,
+  type TaskCompletionEvent,
+} from './events.js';
+
+export {
+  type TokenDistribution,
+  type CorrectionFactors,
+  type QualityPrediction,
+  type PredictionData,
+  type PredictionMetadata,
+  type PredictionResponse,
+  type PredictionQuery,
+} from './predictions.js';
+
+export {
+  type BatchEventRequest,
+  type BatchEventResult,
+  type BatchEventResponse,
+  type BatchPredictionRequest,
+  type BatchPredictionResponse,
+} from './common.js';