feat(manifold): default to geometric push + add Clear examples button

Geometric-dislike ('Push away', Mode 1) is now the default feedback mode
instead of explore-and-place, which works poorly. Add a Clear button to
the Learning drawer that forgets all recorded examples and wipes the
on-map visuals (feedback markers + placed-anchor pins) via the existing
ctx.onClear, now also resetting pins.

manifold/ONBOARDING.md

@@ -196,9 +196,10 @@ a setting → `--r-*` tokens.
 
 ### Feedback — `src/feedback/`
 - `controller.ts` (**~490 lines**) — `FeedbackController`, framework-neutral, owned by ConsoleApp.
-  Two modes: **explore-and-place** (default, Mode 2, positive-only — drives the C++ core's
-  snapshot/scratchpad/undo lifecycle; caller accumulates anchors and trains on finalise with
-  warm-start) and **geometric-dislike** (Mode 1, selectable). Solo/arm via per-output mask.
+  Two modes: **geometric-dislike** (default, Mode 1, "Push away" — down carves the current sound
+  away from what you like, directed repulsion) and **explore-and-place** (Mode 2, positive-only,
+  selectable — drives the C++ core's snapshot/scratchpad/undo lifecycle; caller accumulates anchors
+  and trains on finalise with warm-start). Solo/arm via per-output mask.
 - `rng.ts` — `SeededRng` (deterministic xorshift32 + gaussian). **Stand-in** until the C++ nudge owns
   the stream — not bit-identical to `nisps::Rng`.
 - **`--- C++ GAP ---` markers** flag behaviour approximated in TS pending C++ port: true geometric

manifold/src/console/ConsoleApp.tsx

@@ -112,8 +112,9 @@ export function ConsoleApp({ focus: initialFocus = 'composite' }: ConsoleAppProp
   const [sandwich, setSandwich] = useState(false);
 
   // Learning-behaviour store (dock-spec §1; rl-feedback-design). Default
-  // feedback mode = "Explore and place"; default solo = "Mask gradients".
-  const [feedbackMode, setFeedbackModeState] = useState<FeedbackModeUI>('explore-and-place');
+  // feedback mode = "Push away" (geometric); default solo = "Mask gradients".
+  // (Explore-and-place is selectable but the geometric push is the better default.)
+  const [feedbackMode, setFeedbackModeState] = useState<FeedbackModeUI>('geometric-dislike');
   const [soloMode, setSoloMode] = useState<SoloMode>('mask-gradients');
   const [exploring, setExploring] = useState(false);
   const [learningPaused, setLearningPaused] = useState(false);
@@ -654,10 +655,14 @@ export function ConsoleApp({ focus: initialFocus = 'composite' }: ConsoleAppProp
     onAddExample: addExample,
     onTrain: train,
     onClear: () => {
+      // Drop the recorded training examples AND every on-map visual that
+      // represents them (feedback markers + placed-anchor pins). The cursor
+      // trail is ephemeral and self-decays, so it needs no explicit reset.
       engine?.clearExamples();
       setExamples(0);
       setLoss([]);
       setMarkers([]);
+      setPins([]);
     },
     snapshots,
     onJump: (id) => {

manifold/src/console/Drawers.tsx

@@ -168,6 +168,19 @@ function LearningDrawer(ctx: ConsoleCtx, depth: DrawerDepth) {
         </p>
       )}
 
+      <SectionLabel>Recorded examples</SectionLabel>
+      <div style={{ display: 'flex', gap: 8, alignItems: 'center' }}>
+        <Chip>
+          {ctx.datasetCount} example{ctx.datasetCount === 1 ? '' : 's'}
+        </Chip>
+        <Button size="sm" variant="secondary" onClick={ctx.onClear}>
+          Clear
+        </Button>
+        <span style={{ fontSize: 'var(--fs-xs)', color: 'var(--fg-dim)' }}>
+          forget every example & wipe the on-map marks
+        </span>
+      </div>
+
       {depth === 'expanded' && (
         <>
           <SectionLabel>Solo / arm scope</SectionLabel>