Approve Shu cavalry scout handpainted sprite v4

docs/unit-sprite-shu-cavalry-scout-v4-approval-packet.md

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+# Unit Sprite Approval Packet: unit-shu-cavalry-scout v4
+
+- Status: approved during continuous production run
+- Source art: `docs/handpaint-batch2-shu-cavalry-scout-source-v4.png`
+- Contact sheet: `docs/handpaint-batch2-shu-cavalry-scout-v4-contact.png`
+- Animation GIF: `docs/handpaint-batch2-shu-cavalry-scout-v4-animation.gif`
+- Before/after: `docs/handpaint-batch2-shu-cavalry-scout-v4-before-after.png`
+- Scale compare: `docs/handpaint-batch2-shu-cavalry-scout-v4-scale-compare.png`
+- Browser check: `docs/handpaint-batch2-shu-cavalry-scout-v4-debug-preview-battle-check.png`
+- Current approval board: `docs/unit-sprite-current-approval-board.png`
+- Debug preview URL: `http://127.0.0.1:4173/heros_web/?debug&debugSpritePreview=unit-shu-cavalry-scout&v=shu-cavalry-scout-v4-console-clean`
+
+## Visual Decision
+
+Shu cavalry scout v4 is accepted as a light mounted scout. Earlier versions needed height and front-width stability adjustments; v4 keeps the compact horse-and-rider silhouette, short spear/banner, and lighter scout role distinct from regular cavalry.
+
+## Technical Checks
+
+- Base partial alpha: `0`
+- Action partial alpha: `0`
+- Base frame border hits: `0`
+- Action frame border hits: `0`
+- Base empty frames: `0`
+- Action empty frames: `0`
+- Base bbox width range: `140..262`
+- Base bbox height range: `276..290`
+- Base bottom range: `303..303`
+- Action bbox width range: `140..300`
+- Action bbox height range: `276..295`
+- Action bottom range: `303..303`
+- Local build: `passed`
+- Local browser console errors: `0`
+
+## Notes
+
+The horse and rider remain readable at desktop battle scale without external bases or selection rings. The smaller mounted footprint supports the scout role while preserving a clear cavalry silhouette.