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Finished the deferred Phase D pieces from PEN_TOOL_FEATURE.md. New affordances on the editable pen layer: - Click a segment between anchors → inserts a new anchor at the click point via de Casteljau cubic split. Curve shape is preserved exactly: a's hOut, b's hIn, and the new mid-anchor's handles all derive from the split. Lines (no handles either side) get a plain midpoint anchor with no handles. The new anchor is selected and immediately drag-able. - Right-click an anchor → delete it. Suppresses the browser context menu on the pen overlay always. - Backspace / Delete with an anchor selected → delete it. Layer-delete still wins when no anchor is selected. The pen tool's selected-anchor sentinel `_penSelectedAnchor` is reset on tool change. - Alt-click an anchor → toggle between `kind: 'corner'` (handles move independently) and `kind: 'smooth'` (handles stay mirrored across the anchor). Promoting to smooth re-derives the missing handle (or re-mirrors both if independent) so the curve actually becomes continuous. New nodes from pen click-drag default to smooth; new nodes from a single click are corners. - Drag an anchor or handle past the original 0–100 viewBox → the layer's bounding rect auto-refits. New `refitPenLayerIfNeeded` computes the bbox over all nodes + handles, translates layer.x/y by the bbox offset (scaled to current w/h), updates layer.w/h, then remaps every node into the new 0–100 space. Path stays visually anchored to the canvas — no more clipping at the layer edge. Anchor glyphs now distinguish kind: smooth = circle (existing look), corner = square. The selected anchor renders with an amber stroke (#f97316) so the Backspace-to-delete target is unmistakable. Spec updated to mark Phase D complete and the deferred items shipped. Rotated paths are still not node-editable in v1 (the deferral remains).