chore(desktop): trivial quality sweep — dedup classList.add / strip lane codenames from CSS + file headers

T-01 chat-session-graph.js: remove redundant classList.add (setAttribute
    below already sets 'active'; leftover from lane-chat-triple merge).
T-02 style.css: rewrite two section headers to describe *what* the section
    is, not which internal lane produced it (Rubric-driven views / Artifact
    panel tabbed views + version evolution).
T-04-partial chat-session-graph.js / chat-side-drawer.js / growth-v2.js:
    drop 'feat/chat-triple-view', 'lane-chat-triple', 'task #140' codenames
    from file header docblocks — user-facing source hygiene.

4 files, +5/-7, no behavior change.

examples/desktop/src/renderer/chat-session-graph.js

@@ -1,5 +1,5 @@
 // chat-session-graph.js — pure-SVG DAG rendering of a session's turn
-// sequence for the Chat pane's Graph view (feat/chat-triple-view).
+// sequence for the Chat pane's Graph view.
 //
 // Nodes: user messages (grey), agent turns (accent), interrupted turns
 // (orange rim). Edges:
@@ -157,7 +157,6 @@ function renderSessionGraph(container, snapshot) {
     g.dataset.nodeKind = node.kind
     if (node.turnId) g.dataset.turnId = node.turnId
     if (node.turnId && snapshot && snapshot.selectedTurnId === node.turnId) {
-      g.classList && g.classList.add && g.classList.add('active')
       g.setAttribute('class', cls + ' active')
     }
     const circle = doc.createElementNS(SVG_NS, 'circle')

examples/desktop/src/renderer/chat-side-drawer.js

@@ -1,5 +1,4 @@
-// chat-side-drawer.js — right-side fold-out drawer for the Chat pane
+// chat-side-drawer.js — right-side fold-out drawer for the Chat pane.
-// (feat/chat-triple-view, lane-chat-triple).
 //
 // Three sections rendered in order:
 //   1. Current Turn — model / tokens / duration / latency / session id /

examples/desktop/src/renderer/growth-v2.js

@@ -1,6 +1,6 @@
 // Growth — rubric-evolution time-series view.
 //
-// This page was the "compact-window evolution log" (task #140). It has been
+// This page was previously the "compact-window evolution log". It has been
 // re-authored as a rubric-score time-series view backed by the rubric-fusion
 // event log. Horizontal axis = time (day) or harness version; each series =
 // one rubric-dim; y = mean-01 score (or pass-rate, toggled by the header

examples/desktop/src/renderer/style.css

@@ -12144,7 +12144,7 @@ details.devtools-row[open] > .devtools-row-summary::before { transform: rotate(9
  * inside it, not against the viewport root. */
 .pane[data-pane="chat"] { position: relative; }
 /* ============================================================ */
-/* D lane: Rubric fusion (Rubrics + Growth + Runtime shared)    */
+/* Rubric-driven views (Rubrics + Growth + Runtime)             */
 /* ============================================================ */
 
 /* --- Rubrics view: hint card + per-tile stats strip --- */
@@ -12395,7 +12395,7 @@ details.devtools-row[open] > .devtools-row-summary::before { transform: rotate(9
   outline-offset: -2px;
 }
 /* ==========================================================================
- * Artifact panel — V2 (lane-artifact-v2, 2026-07-19)
+ * Artifact panel — tabbed views + version evolution
  *
  * The panel wraps the artifact-group with a top tab bar (List/Board/
  * Timeline). Keeps the L0 compact-row shape intact for List; Board and