Claude/refactor reloadmod fix i l1 kd#77
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Some games (e.g. "2015g1") first draw a modded mesh with a vertex layout that lacks NORMAL (likely a depth/shadow pass). The mod VB gets filled from that layout, leaving zeros where the normal should be. A later draw with a layout that does include NORMAL then reuses the bad VB and the mod renders with garbage normals. Detect that mismatch and refill: - Store a u128 bitmask of (semantic, semantic_index) pairs declared by the fill layout on ModD3DData11, populated in load_d3d_data11. - On each modded draw, recompute the current layout's mask and bail out to the reload path if it has any bits the fill mask doesn't. - Hot-path check is two map lookups + a bitwise op; no locks, no global. The closure passed to check_and_render_mod gets only an immutable mod ref, so the refill request bubbles up via an override variable and the existing NotRenderedButLoadRequested handler does the work, via a new mod_load::reset_for_reload helper that releases the d3d data and transitions back to Unloaded. https://claude.ai/code/session_018KSB4LpgEY7ZyheoHr1A4Y
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