feat(task-90): Complete subtask 90.2

- Implement secure telemetry submission service
- Created scripts/modules/telemetry-submission.js with submitTelemetryData function
- Implemented secure filtering: removes commandArgs and fullOutput before remote submission
- Added comprehensive validation using Zod schema for telemetry data integrity
- Implemented exponential backoff retry logic (3 attempts max) with smart retry decisions
- Added graceful error handling that never blocks execution
- Respects user opt-out preferences via config.telemetryEnabled
- Configured for localhost testing endpoint (http://localhost:4444/api/v1/telemetry) for now
- Added comprehensive test coverage with 6/6 passing tests covering all scenarios
- Includes submitTelemetryDataAsync for fire-and-forget submissions

scripts/modules/telemetry-submission.js

@@ -0,0 +1,137 @@
+/**
+ * Telemetry Submission Service
+ * Handles sending telemetry data to remote gateway endpoint
+ */
+
+import { z } from "zod";
+import { getConfig } from "./config-manager.js";
+
+// Telemetry data validation schema
+const TelemetryDataSchema = z.object({
+  timestamp: z.string().datetime(),
+  userId: z.string().min(1),
+  commandName: z.string().min(1),
+  modelUsed: z.string().optional(),
+  providerName: z.string().optional(),
+  inputTokens: z.number().optional(),
+  outputTokens: z.number().optional(),
+  totalTokens: z.number().optional(),
+  totalCost: z.number().optional(),
+  currency: z.string().optional(),
+  commandArgs: z.any().optional(),
+  fullOutput: z.any().optional(),
+});
+
+// Configuration
+const GATEWAY_ENDPOINT = "http://localhost:4444/api/v1/telemetry";
+const MAX_RETRIES = 3;
+const RETRY_DELAY = 1000; // 1 second
+
+/**
+ * Submits telemetry data to the remote gateway endpoint
+ * @param {Object} telemetryData - The telemetry data to submit
+ * @returns {Promise<Object>} - Result object with success status and details
+ */
+export async function submitTelemetryData(telemetryData) {
+  try {
+    // Check user opt-out preferences first
+    const config = getConfig();
+    if (config && config.telemetryEnabled === false) {
+      return {
+        success: true,
+        skipped: true,
+        reason: "Telemetry disabled by user preference",
+      };
+    }
+
+    // Validate telemetry data
+    try {
+      TelemetryDataSchema.parse(telemetryData);
+    } catch (validationError) {
+      return {
+        success: false,
+        error: `Telemetry data validation failed: ${validationError.message}`,
+      };
+    }
+
+    // Filter out sensitive fields before submission
+    const { commandArgs, fullOutput, ...safeTelemetryData } = telemetryData;
+
+    // Attempt submission with retry logic
+    let lastError;
+    for (let attempt = 1; attempt <= MAX_RETRIES; attempt++) {
+      try {
+        const response = await fetch(GATEWAY_ENDPOINT, {
+          method: "POST",
+          headers: {
+            "Content-Type": "application/json",
+          },
+          body: JSON.stringify(safeTelemetryData),
+        });
+
+        if (response.ok) {
+          const result = await response.json();
+          return {
+            success: true,
+            id: result.id,
+            attempt,
+          };
+        } else {
+          // Handle HTTP error responses
+          const errorData = await response.json().catch(() => ({}));
+          const errorMessage = `HTTP ${response.status} ${response.statusText}`;
+
+          // Don't retry on certain status codes (rate limiting, auth errors, etc.)
+          if (
+            response.status === 429 ||
+            response.status === 401 ||
+            response.status === 403
+          ) {
+            return {
+              success: false,
+              error: errorMessage,
+              statusCode: response.status,
+            };
+          }
+
+          // For other HTTP errors, continue retrying
+          lastError = new Error(errorMessage);
+        }
+      } catch (networkError) {
+        lastError = networkError;
+      }
+
+      // Wait before retry (exponential backoff)
+      if (attempt < MAX_RETRIES) {
+        await new Promise((resolve) =>
+          setTimeout(resolve, RETRY_DELAY * Math.pow(2, attempt - 1))
+        );
+      }
+    }
+
+    // All retries failed
+    return {
+      success: false,
+      error: lastError.message,
+      attempts: MAX_RETRIES,
+    };
+  } catch (error) {
+    // Graceful error handling - never throw
+    return {
+      success: false,
+      error: `Telemetry submission failed: ${error.message}`,
+    };
+  }
+}
+
+/**
+ * Submits telemetry data asynchronously without blocking execution
+ * @param {Object} telemetryData - The telemetry data to submit
+ */
+export function submitTelemetryDataAsync(telemetryData) {
+  // Fire and forget - don't block execution
+  submitTelemetryData(telemetryData).catch((error) => {
+    // Silently log errors without blocking
+    console.debug("Telemetry submission failed:", error);
+  });
+}