Wave 7 close-out: the graphTools surface, wrapped cluster labels, the orphan sweep

Part 1 — the surface:
- Settings ▸ Agent ▸ Tools gains the prober GRAPH-TOOLS row as its FIRST
  row (owner ruling: in the Tools section, not the tool-toggles list —
  its subject is the map, its mechanism is agent capability). Writes
  agent.graphTools {enabled} (absent = on, the toggle discipline) via
  the section PUT; composeGraphTools pure seam. Its own key in the agent
  contract — never in the tools map.
- The row carries the search-row hint discipline: "Connects prior
  sessions' knowledge into new ones — the prober reads the knowledge
  map" (owner wording). The honest interplay composes both: when
  graph.enabled is off the row dims + disables with a "Graph is
  disabled" hint (the effective gate itself is server-side, per-turn
  fresh). AgentSection reads the graph section (record.graph, passed by
  the dialog) — read-only.
- Cluster labels wrap: wave 7 made labels session names and FILE PATHS,
  which the old single-line fillText could not bound. wrapRegionLabel
  (pure, exported): word-wrap first, char-split long paths (the
  node-label discipline), capped at 3 lines, overflow folded into an
  ellipsized last line (owner: wrap, cap 2–3, ellipsize). Pre-wrapped
  once per geometry build at the SCREEN-fixed size (viewer-relative
  labels — the wrap never goes stale mid-camera-move), drawn centered
  line-by-line at the centroid. Deleted-session clusters keep their
  hull-only honest silence (label null → no lines).
- The orphan sweep: StatsBar's leftSlot prop is dead (its one consumer,
  the knowledge-context slider, died in c690181) — removed, and pre-chat
  views now render NOTHING on the left (owner ruling this round: a
  "— · —" summary over an empty popover is pure noise) — the dictation
  middle just widens. Stale knowledge-context comments swept in
  chat.tsx (adoption-window + activity-nudge docs), activity-dock.tsx
  (useActivity ground rules), dictation.tsx (×2 adaptive-meter docs),
  home.tsx (pre-chat dock comment).

Part 2 — Teacher's c690181 review: clean. Imports, KIND_ICON/KIND_LABEL
entries, render branches and event seams all excised whole; the probe-
handoff branch re-indented intact and merge-adopted; tests updated in
lockstep (merge-adopted, record-adapter, render-new-session retired).
Platform's 4b60e0f roster-string fixes (labeler dropped from both
SLOT_META blocks) reviewed — consistent across agent-section +
setup-dialog.

Gates: tsc clean, 854/854 (8 new: wrapRegionLabel cases, graphTools
SSR rows ×3; stats-bar + ladder fixtures updated to the new rulings),
lint 0, build ok. Live on :3001: graphTools row first-in-group with
hint, off→{enabled:false}→on round-trip, graph-off dimming + hint +
disabled toggle, pre-chat rows summary-free, chat view keeps its
summary, long-title cluster label wrapped without console errors
(visual read unavailable this session — pure wrap is unit-pinned).

components/stats-bar.tsx

@@ -11,11 +11,10 @@ import { ModelControl } from "@/components/model-picker";
  * LEFT-aligned: context window + session cost; RIGHT-aligned: model +
  * thinking level. Clicking the left side opens the per-turn detail popover.
  *
- *  Pre-chat views (home, /chat/new) pass `leftSlot`: with no session there
- *  IS no session data (the summary would just read "—"), so that left side
- *  is free real estate — the knowledge-context budget slider lives there
- *  (vision-context-injection.md), vertically centered beside the model +
- *  thinking pills by the row's own geometry.
+ *  Pre-chat views (home, /chat/new) render NO left side at all (owner,
+ *  wave 7 sweep: the knowledge-context budget slider that used to live
+ *  there died with the injection; a "— · —" summary over an empty
+ *  popover is pure noise) — the dictation strip's middle simply widens.
  *
  * All folds come from core/prices.ts (sessionCost, contextWindow, turnCost)
  * — no cost math lives here. Absent data renders "—", never zero (the
@@ -29,13 +28,9 @@ import { ModelControl } from "@/components/model-picker";
  */
 export function StatsBar({
 	turns,
-	leftSlot,
 	dictationSlot,
 }: {
 	turns: TurnUsage[];
-	/** Pre-chat only: replaces the (empty) session-data summary — home and
-	 *  the /chat/new draft mount the knowledge-context slider here. */
-	leftSlot?: ReactNode;
 	/** The dictation strip (STT wave, 2026-09-17): the row's middle is dead
 	 *  space between the session data and the model control — the mic
 	 *  button lives there, and while recording the meter unfurls to fill
@@ -84,9 +79,9 @@ export function StatsBar({
 			    outside-close ref anchors HERE too (owner, round 3): on the whole
 			    bar it wrapped the model control, so clicking model/thinking never
 			    counted as outside — the asymmetry the owner observed. */}
-			{/* The left side: the session-data summary, or — pre-chat — the
-			    caller's slot (the knowledge-context slider) in its place. */}
-			{leftSlot ?? (
+			{/* The left side: the session-data summary — only once a session
+			    exists (turns). Pre-chat renders nothing (see the header). */}
+			{turns.length > 0 && (
 			<div ref={barRef} className="relative">
 				<button
 					type="button"