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>

scripts/validate-schema.ts

@@ -0,0 +1,65 @@
+/**
+ * Validates that the TypeScript types match the expected server schema.
+ * This script is meant to be run manually when the server schema changes.
+ */
+
+import {
+  TaskType,
+  Complexity,
+  Harness,
+  Provider,
+  QualityGate,
+  Outcome,
+  RepoSizeCategory,
+} from '../src/types/events.js';
+
+function validateEnum(name: string, enumObj: Record<string, string>, expected: string[]): boolean {
+  const values = Object.values(enumObj);
+  const missing = expected.filter((v) => !values.includes(v));
+  const extra = values.filter((v) => !expected.includes(v));
+
+  if (missing.length > 0 || extra.length > 0) {
+    console.error(`${name} mismatch:`);
+    if (missing.length) console.error(`  Missing: ${missing.join(', ')}`);
+    if (extra.length) console.error(`  Extra: ${extra.join(', ')}`);
+    return false;
+  }
+
+  console.log(`${name}: OK (${values.length} values)`);
+  return true;
+}
+
+let allValid = true;
+
+allValid = validateEnum('TaskType', TaskType, [
+  'planning', 'implementation', 'code_review', 'testing', 'debugging',
+  'refactoring', 'documentation', 'configuration', 'security_audit', 'unknown',
+]) && allValid;
+
+allValid = validateEnum('Complexity', Complexity, ['low', 'medium', 'high', 'critical']) && allValid;
+
+allValid = validateEnum('Harness', Harness, [
+  'claude_code', 'opencode', 'kilo_code', 'aider', 'api_direct',
+  'ollama_local', 'custom', 'unknown',
+]) && allValid;
+
+allValid = validateEnum('Provider', Provider, [
+  'anthropic', 'openai', 'openrouter', 'ollama', 'google', 'mistral', 'custom', 'unknown',
+]) && allValid;
+
+allValid = validateEnum('QualityGate', QualityGate, [
+  'build', 'lint', 'test', 'coverage', 'typecheck', 'security',
+]) && allValid;
+
+allValid = validateEnum('Outcome', Outcome, ['success', 'failure', 'partial', 'timeout']) && allValid;
+
+allValid = validateEnum('RepoSizeCategory', RepoSizeCategory, [
+  'tiny', 'small', 'medium', 'large', 'huge',
+]) && allValid;
+
+if (allValid) {
+  console.log('\nAll enums validated successfully.');
+} else {
+  console.error('\nSchema validation failed.');
+  process.exit(1);
+}