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.
6c4d0ae805