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>

CLAUDE.md

@@ -0,0 +1,30 @@
+# @mosaicstack/telemetry-client
+
+TypeScript/JavaScript client SDK for Mosaic Stack Telemetry. Zero runtime dependencies.
+
+## Commands
+
+```bash
+npm install          # Install dependencies
+npm run typecheck    # Type check
+npm run lint         # Lint
+npm run format:check # Format check
+npm test             # Run tests
+npm run test:coverage # Tests with coverage (85% threshold)
+npm run build        # Build to dist/
+```
+
+## Architecture
+
+- `client.ts` — TelemetryClient (main public API, setInterval-based background flush)
+- `queue.ts` — EventQueue (bounded FIFO array)
+- `submitter.ts` — BatchSubmitter (native fetch, exponential backoff, Retry-After)
+- `prediction-cache.ts` — PredictionCache (Map + TTL)
+- `event-builder.ts` — EventBuilder (auto-generates event_id, timestamp)
+- `types/` — Standalone type definitions matching server API schema v1.0
+
+## Key Patterns
+
+- `track()` never throws — catches everything, routes to `onError` callback
+- Zero runtime deps: uses native `fetch` (Node 18+), `crypto.randomUUID()`, `setInterval`
+- All types are standalone — no dependency on the telemetry server package