[neeerp]

Lane C slice c30 (LEDGER 3002, report v83ref/reports/c022-enchant-dialog.md).

HeavenClient gets Legendary Spirit's window (v83 CUIEnchantSkill on UIWindow.img/EnchantSkill), opened by the skill's key (1003, 10001003, 20001003):

• An equip dropped in from the Equip tab (cash refused with "You may not use scrolls on this item." unless it is a pet's), then a scroll from the Use tab, sent at once as 0x56 {tick, scroll, +equip slot, ws 1/2, 1}.
• The White Scroll box shows only while the player holds one.
• The server's 0xA7 for the player's own legendary request goes to the window alone: -1 shows "You cannot use a Scroll with this item."; otherwise the Enchant sound and the window effect (26 frames), then the chat line, the scroll sound and glow. A cursed equip closes the window; otherwise it waits for the next scroll. Cancel/Close/Esc wait for the answer.
• Sealed scrolls are refused; a sealed equip asks first; alerted/dead refusals as for normal scrolls.
• Docs: agent_docs/inventory.md.

Verification (M): ctest 152/152 (scroll_rules tests for the new helpers), GUI check on the lane stack (window, drop, tooltip, White Scroll box, effect with Cancel disabled, chat line; DB shows the scroll and White Scroll used, slots kept), one Sonnet review (fixed: the chat line no longer tells of a White Scroll that wasn't sent; stale comment).