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>

package.json

@@ -0,0 +1,42 @@
+{
+  "name": "@mosaicstack/telemetry-client",
+  "version": "0.1.0",
+  "description": "TypeScript client SDK for Mosaic Stack Telemetry",
+  "type": "module",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    }
+  },
+  "engines": {
+    "node": ">=18"
+  },
+  "files": [
+    "dist"
+  ],
+  "license": "MPL-2.0",
+  "scripts": {
+    "build": "tsc -p tsconfig.build.json",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "test:coverage": "vitest run --coverage",
+    "lint": "eslint src/ tests/",
+    "lint:fix": "eslint src/ tests/ --fix",
+    "format": "prettier --write src/ tests/",
+    "format:check": "prettier --check src/ tests/",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {},
+  "devDependencies": {
+    "typescript": "^5.5.0",
+    "vitest": "^2.0.0",
+    "@vitest/coverage-v8": "^2.0.0",
+    "eslint": "^9.0.0",
+    "@typescript-eslint/eslint-plugin": "^8.0.0",
+    "@typescript-eslint/parser": "^8.0.0",
+    "prettier": "^3.0.0"
+  }
+}