fix(telemetry_public): add server_time + full envelope to match tool convention

workers/src/index.ts

@@ -449,13 +449,18 @@ Time filter example: WHERE timestamp > NOW() - INTERVAL '30' DAY`,
       openWorldHint: true,
     },
     async ({ sql }) => {
+      const startTime = Date.now();
+
       if (!env.CF_ACCOUNT_ID || !env.CF_API_TOKEN) {
         return {
           content: [{
             type: "text" as const,
             text: JSON.stringify({
               action: "telemetry_public",
               result: { error: "Telemetry queries not configured. CF_ACCOUNT_ID and CF_API_TOKEN required." },
+              server_time: new Date().toISOString(),
+              assistant_text: "Telemetry queries not configured. Set CF_ACCOUNT_ID and CF_API_TOKEN.",
+              debug: { duration_ms: Date.now() - startTime },
             }, null, 2),
           }],
         };
@@ -482,12 +487,26 @@ Time filter example: WHERE timestamp > NOW() - INTERVAL '30' DAY`,
         result = { error: "Query execution failed." };
       }
 
+      // Derive row count for assistant_text when the result carries data rows
+      let assistantText = "Telemetry query completed.";
+      if (typeof result === 'object' && result !== null) {
+        if ('error' in result) {
+          assistantText = "Telemetry query completed with errors.";
+        } else if ('data' in result && Array.isArray((result as Record<string, unknown>).data)) {
+          const rows = ((result as Record<string, unknown>).data as unknown[]).length;
+          assistantText = `Telemetry query returned ${rows} row${rows === 1 ? "" : "s"}.`;
+        }
+      }
+
       return {
         content: [{
           type: "text" as const,
           text: JSON.stringify({
             action: "telemetry_public",
             result: { data: result, generated_at: new Date().toISOString() },
+            server_time: new Date().toISOString(),
+            assistant_text: assistantText,
+            debug: { duration_ms: Date.now() - startTime },
           }, null, 2),
         }],
       };

workers/test/canon-tool-envelope.smoke.mjs

@@ -129,7 +129,14 @@ async function run() {
     `got: ${policyOverride.debug?.knowledge_base_url}`,
   );
 
-  // Tool 4: oddkit_encode — canon-driven, DOLCHEO-aware. Full envelope +
+  // Tool 4: telemetry_public — should have full envelope (no governance_source)
+  console.log("\n─── Testing: telemetry_public ───");
+  const telemetryPublicResult = await callTool("telemetry_public", {
+    sql: "SELECT 1 AS probe FROM oddkit_telemetry WHERE timestamp > NOW() - INTERVAL '1' HOUR LIMIT 1"
+  });
+  expectFullEnvelope("telemetry_public", telemetryPublicResult);
+
+  // Tool 5: oddkit_encode — canon-driven, DOLCHEO-aware. Full envelope +
   // governance_source + DOLCHEO prefix-tag batch mode + Open facet + back-
   // compat for unprefixed input.
   console.log(`\n─── oddkit_encode: envelope + governance_source ───`);