feat: recompute basic watchdog statuses

scripts/subagent_delivery_watchdog.mjs

@@ -182,6 +182,47 @@ function writeCompletionReceiptState(payload) {
   };
 }
 
+function parseTime(value) {
+  if (typeof value !== 'string' || value.length === 0) {
+    return null;
+  }
+
+  const timestamp = Date.parse(value);
+  return Number.isNaN(timestamp) ? null : timestamp;
+}
+
+function recomputeStatus(payload) {
+  if (!payload || typeof payload !== 'object') {
+    return 'not_implemented';
+  }
+
+  const completionReceivedAt = payload.completionReceivedAt ?? payload.completionReceiptAt ?? null;
+  if (parseTime(completionReceivedAt) !== null) {
+    return 'completed';
+  }
+
+  const hasDispatch = [payload.runId, payload.childSessionKey, payload.dispatchAt, payload.expectedBy].every(
+    (value) => typeof value === 'string' && value.length > 0,
+  );
+
+  if (!hasDispatch) {
+    return 'not_implemented';
+  }
+
+  const expectedBy = parseTime(payload.expectedBy);
+  const currentTime = parseTime(payload.currentTime);
+
+  if (expectedBy === null || currentTime === null) {
+    return 'not_implemented';
+  }
+
+  if (currentTime > expectedBy) {
+    return 'suspect_delivery_failure';
+  }
+
+  return 'active';
+}
+
 function main() {
   const args = parseArgs(process.argv.slice(2));
 
@@ -194,6 +235,7 @@ function main() {
   const inputPayload = input.exists ? tryParseJson(input.content) : null;
   const dispatchWrite = writeDispatchReceiptState(inputPayload);
   const completionWrite = writeCompletionReceiptState(inputPayload);
+  const status = recomputeStatus(inputPayload);
 
   if ('content' in input) {
     delete input.content;
@@ -210,7 +252,7 @@ function main() {
   const response = {
     ok: true,
     tool: 'subagent_delivery_watchdog',
-    version: 'skeleton-v3',
+    version: 'skeleton-v4',
     mode: 'receipt-write',
     args: {
       compact: args.compact,
@@ -218,8 +260,10 @@ function main() {
     },
     input,
     result: {
-      status: 'not_implemented',
-      message: 'Dispatch and completion receipt writes are implemented; status recompute remains pending.',
+      status,
+      message: status === 'not_implemented'
+        ? 'Dispatch and completion receipt writes are implemented; status recompute only handles basic active/suspect/completed states.'
+        : 'Basic watchdog status recompute completed.',
       records,
       dispatchReceiptWrite: dispatchWrite,
       completionReceiptWrite: completionWrite,