Measure semantic activation refresh independently from download and idle time

apps/desktop/src/main.ts

@@ -30,7 +30,11 @@ import {
   spanDepth,
   briefMs,
 } from "./search-performance";
-import type { MeasuredResponse, SearchLane } from "./search-performance";
+import type {
+  MeasuredResponse,
+  SearchLane,
+  SearchRefreshTrigger,
+} from "./search-performance";
 import { displayPath } from "./path-display";
 import { ResultSelection } from "./selection-state";
 import {
@@ -449,7 +453,7 @@ async function refreshSemanticStatus() {
       canSearchSemantically() &&
       latestSearch?.id === requestId
     )
-      submitSearch(latestSearch, "hybrid");
+      refreshIndexedSearch("semantic_activation");
     if (working || (!status.ready && !error)) queueSemanticRefresh();
   } catch (error) {
     element("semantic-status").textContent =
@@ -1088,7 +1092,22 @@ function submitSearch(request: SearchRequest, lane: SearchLane) {
   (lane === "lexical" ? lexicalLane : hybridLane).submit(request);
 }
 
-function refreshIndexedSearch() {
+function searchMeasurementContext() {
+  return {
+    model: semanticStatus?.worker_info?.model ?? null,
+    device: semanticStatus?.worker_info?.device ?? null,
+    runtime: semanticStatus?.worker_info?.runtime ?? null,
+    threads: semanticStatus?.worker_info?.threads ?? null,
+    dimensions: semanticStatus?.worker_info?.dimensions ?? null,
+    semantic_ready: canSearchSemantically(),
+    semantic_generation: semanticStatus?.generation ?? null,
+    indexed_chunks: semanticStatus?.chunks ?? null,
+  };
+}
+
+function refreshIndexedSearch(
+  trigger: SearchRefreshTrigger = "filesystem_refresh",
+) {
   const previous = latestSearch;
   if (
     !previous ||
@@ -1106,7 +1125,11 @@ function refreshIndexedSearch() {
     ...previous,
     id: ++requestId,
     started: refreshStarted,
-    measurement: previous.measurement.freshForRefresh(refreshStarted),
+    measurement: previous.measurement.freshForRefresh(
+      refreshStarted,
+      trigger,
+      searchMeasurementContext(),
+    ),
   };
   latestSearch = refreshed;
   submitSearch(refreshed, "lexical");
@@ -1188,15 +1211,7 @@ async function search(inputAt = performance.now()) {
         inputAt,
         performance.now(),
         element<HTMLInputElement>("performance-toggle").checked,
-        {
-          model: semanticStatus?.worker_info?.model ?? null,
-          device: semanticStatus?.worker_info?.device ?? null,
-          runtime: semanticStatus?.worker_info?.runtime ?? null,
-          threads: semanticStatus?.worker_info?.threads ?? null,
-          dimensions: semanticStatus?.worker_info?.dimensions ?? null,
-          semantic_ready: canSearchSemantically(),
-          indexed_chunks: semanticStatus?.chunks ?? null,
-        },
+        searchMeasurementContext(),
       ),
     };
     latestSearch = request;

apps/desktop/src/search-performance.ts

@@ -17,6 +17,7 @@ export interface MeasuredResponse<T> {
   metrics: NativeMetrics;
 }
 export type SearchLane = "lexical" | "hybrid";
+export type SearchRefreshTrigger = "filesystem_refresh" | "semantic_activation";
 export interface AttemptStart {
   lane: SearchLane;
   startedAt: number;
@@ -44,6 +45,7 @@ interface InputTimingSummary {
 
 export class SearchMeasurement {
   private originalInput: Readonly<InputTimingSummary> | null = null;
+  private trigger: "user_search" | SearchRefreshTrigger = "user_search";
   debug: boolean;
   inputAt: number;
   scheduledAt: number;
@@ -74,9 +76,14 @@ export class SearchMeasurement {
     this.debug = debug;
     this.context = { ...context };
   }
-  /** Filesystem updates are independent requests, not elapsed user idle time. */
-  freshForRefresh(now: number): SearchMeasurement {
-    const refreshed = new SearchMeasurement(now, now, this.debug, this.context);
+  /** Background updates are independent requests, not elapsed user idle time. */
+  freshForRefresh(
+    now: number,
+    trigger: SearchRefreshTrigger = "filesystem_refresh",
+    context = this.context,
+  ): SearchMeasurement {
+    const refreshed = new SearchMeasurement(now, now, this.debug, context);
+    refreshed.trigger = trigger;
     // Preserve one fixed-size numeric snapshot, never an ancestor trace/history.
     // Pending responses on the old request cannot rewrite this snapshot.
     refreshed.originalInput = Object.freeze({
@@ -165,7 +172,7 @@ export class SearchMeasurement {
   export() {
     return {
       version: 1,
-      trigger: this.originalInput ? "filesystem_refresh" : "user_search",
+      trigger: this.trigger,
       original_input: this.originalInput ? { ...this.originalInput } : null,
       context: this.context,
       clock_note: