feat(hooks): emit per-run token usage and duration on run.end

The stats layer reads usage/duration only from run.end, but neither
framework populated them, so tokens/cost/avg-duration were always 0.

- hermes: accumulate token usage across each run's api-result calls in
  session state and attach the summed usage plus a computed duration_ms
  (from a stored runStartedAt) onto run.end. metric.snapshot emission is
  unchanged, so there is no double counting.
- claude-code: store runStartedAt and use it as a duration_ms fallback at
  all run.end sites. Usage is unavailable from CC hook inputs.

Live verification: a real hermes run now reports duration_ms and
total_tokens on run.end; dashboard tokens_today/avg_duration_ms, both
previously 0, now populate. cost_today stays 0 (no provider emits cost
through the hooks).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

hooks/hermes/handler.js

@@ -154,7 +154,8 @@ async function readStdin() {
     let done = false;
     const timer = setTimeout(() => finish(data), 100);
     const finish = (value) => {
-      if (done) return;
+      if (done)
+        return;
       done = true;
       clearTimeout(timer);
       resolve(value);
@@ -172,6 +173,30 @@ var INGEST_URL = process.env.AGENTMON_INGEST_URL || "http://localhost:8080";
 var FRAMEWORK = process.env.AGENTMON_FRAMEWORK || "hermes";
 var HOST = process.env.AGENTMON_HOST || hostname();
 var { enqueue, flush } = createTransport(INGEST_URL);
+var USAGE_TOKEN_FIELDS = [
+  "input_tokens",
+  "output_tokens",
+  "total_tokens",
+  "cache_read_tokens",
+  "cache_write_tokens",
+  "reasoning_tokens",
+  "total_cost"
+];
+function accumulateUsage(into, usage) {
+  if (!usage) {
+    return into;
+  }
+  for (const key of USAGE_TOKEN_FIELDS) {
+    const v = pickNumber(usage[key]);
+    if (v !== void 0) {
+      into[key] = (pickNumber(into[key]) ?? 0) + v;
+    }
+  }
+  return into;
+}
+function runUsagePayload(state) {
+  return state.runUsage && Object.keys(state.runUsage).length > 0 ? state.runUsage : void 0;
+}
 var STATE_DIR = join(homedir(), ".agentmon-state", "hermes");
 function ensureStateDir() {
   try {
@@ -235,19 +260,31 @@ function getToolName(input) {
 function getUsage(input) {
   const extra = getExtra(input);
   const usage = isRecord(input.usage) ? input.usage : isRecord(extra.usage) ? extra.usage : void 0;
-  if (!usage) return void 0;
+  if (!usage)
+    return void 0;
   const result = {};
-  if (usage.input_tokens !== void 0) result.input_tokens = usage.input_tokens;
-  if (usage.prompt_tokens !== void 0) result.input_tokens = usage.prompt_tokens;
-  if (usage.output_tokens !== void 0) result.output_tokens = usage.output_tokens;
-  if (usage.completion_tokens !== void 0) result.output_tokens = usage.completion_tokens;
-  if (usage.cache_read_tokens !== void 0) result.cache_read_tokens = usage.cache_read_tokens;
-  if (usage.cache_write_tokens !== void 0) result.cache_write_tokens = usage.cache_write_tokens;
-  if (usage.cache_creation_tokens !== void 0) result.cache_write_tokens = usage.cache_creation_tokens;
-  if (usage.reasoning_tokens !== void 0) result.reasoning_tokens = usage.reasoning_tokens;
-  if (usage.total_tokens !== void 0) result.total_tokens = usage.total_tokens;
-  if (usage.total_cost !== void 0) result.total_cost = usage.total_cost;
-  if (usage.cost !== void 0) result.total_cost = usage.cost;
+  if (usage.input_tokens !== void 0)
+    result.input_tokens = usage.input_tokens;
+  if (usage.prompt_tokens !== void 0)
+    result.input_tokens = usage.prompt_tokens;
+  if (usage.output_tokens !== void 0)
+    result.output_tokens = usage.output_tokens;
+  if (usage.completion_tokens !== void 0)
+    result.output_tokens = usage.completion_tokens;
+  if (usage.cache_read_tokens !== void 0)
+    result.cache_read_tokens = usage.cache_read_tokens;
+  if (usage.cache_write_tokens !== void 0)
+    result.cache_write_tokens = usage.cache_write_tokens;
+  if (usage.cache_creation_tokens !== void 0)
+    result.cache_write_tokens = usage.cache_creation_tokens;
+  if (usage.reasoning_tokens !== void 0)
+    result.reasoning_tokens = usage.reasoning_tokens;
+  if (usage.total_tokens !== void 0)
+    result.total_tokens = usage.total_tokens;
+  if (usage.total_cost !== void 0)
+    result.total_cost = usage.total_cost;
+  if (usage.cost !== void 0)
+    result.total_cost = usage.cost;
   return Object.keys(result).length > 0 ? result : void 0;
 }
 function getModel(input) {
@@ -301,11 +338,17 @@ async function handleRunStart(input) {
   if (state.runId) {
     enqueue(buildEnvelope(FRAMEWORK, HOST, "run.end", sessionKey, {
       runId: state.runId,
-      payload: { status: "success" }
+      payload: {
+        status: "success",
+        duration_ms: state.runStartedAt ? Date.now() - state.runStartedAt : void 0,
+        ...runUsagePayload(state) && { usage: runUsagePayload(state) }
+      }
     }));
   }
   const runId = randomUUID2();
   state.runId = runId;
+  state.runStartedAt = Date.now();
+  state.runUsage = {};
   saveState(sessionKey, state);
   const extra = getExtra(input);
   enqueue(buildEnvelope(FRAMEWORK, HOST, "run.start", sessionKey, {
@@ -334,12 +377,15 @@ async function handleRunEnd(input) {
       runId: state.runId,
       payload: {
         status: "success",
-        duration_ms: getDuration(input),
+        duration_ms: getDuration(input) ?? (state.runStartedAt ? Date.now() - state.runStartedAt : void 0),
         model: getModel(input),
-        response_preview: truncate(getExtra(input).assistant_response, 500)
+        response_preview: truncate(getExtra(input).assistant_response, 500),
+        ...runUsagePayload(state) && { usage: runUsagePayload(state) }
       }
     }));
     state.runId = void 0;
+    state.runStartedAt = void 0;
+    state.runUsage = {};
     saveState(sessionKey, state);
   }
   await flush();
@@ -405,6 +451,10 @@ async function handleAPIResult(input) {
     await flush();
     return;
   }
+  if (sessionKey) {
+    state.runUsage = accumulateUsage(state.runUsage || {}, usage);
+    saveState(sessionKey, state);
+  }
   enqueue(buildEnvelope(FRAMEWORK, HOST, "metric.snapshot", sessionKey, {
     runId: state.runId,
     payload: {
@@ -426,7 +476,9 @@ async function handleSessionEnd(input) {
       runId: state.runId,
       payload: {
         status: input.interrupted || getExtra(input).interrupted ? "interrupted" : "success",
-        model: getModel(input)
+        duration_ms: state.runStartedAt ? Date.now() - state.runStartedAt : void 0,
+        model: getModel(input),
+        ...runUsagePayload(state) && { usage: runUsagePayload(state) }
       }
     }));
   }