frontend: finish the dashboard comment-density sweep

Continues #3901 (dashboard round 1 was #3906, tabs.js/swarm.js).
Scanned the rest of packages/dashboard/src for the same 'moved to X'/
'now lives in Y' pattern: five more hits in schedules.js, common.js,
logs.js (two, one duplicating the other), core.js, and swarm.js.
All trimmed to state the current location as a fact rather than
narrating the move; one inline duplicate (logs.js's tab-default
comment restating the file-header pointer) dropped outright.

frontend/packages/dashboard/src/logs.js

@@ -1,5 +1,5 @@
 // /logs.html entry point: log viewer with three sub-tabs (AGENT, INFRA,
-// SYSTEM). Build log history has moved to /builds.html.
+// SYSTEM). Build log history lives at /builds.html, not here.
 // AGENT  — per-container journald viewer, backed by GET /api/journal/{name}
 // INFRA  — infra-container journald viewer (hive-ci, hive-forge, …),
 //          same API but full machine journal only (no unit filter)
@@ -230,7 +230,7 @@ import '@hive/shared/hive-tab-strip.js';
   // Wire the shared tab strip now that fetchSystem + the element refs it
   // needs are defined. Its initial show() paints the active pane and, if
   // the deep-linked tab is SYSTEM, kicks off the lazy fetch via onShow.
-  // Default: AGENT (build logs moved to /builds.html).
+  // Default: AGENT.
   logTabs = document.getElementById('logs-tabbar').configure({
     tabs: [
       { id: 'agent', label: 'AGENT' },