Art: EmissiveGloam DOTS instancing + revive EnemyRigTools + drop dead materials (audit M7/M8)

M8 — ProjectM/EmissiveGloam had no DOTS instancing but is bound to
M_Drowner_EyeGlow on EnemyDrowner.prefab, a baked GHOST prefab that
Entities Graphics renders through BatchRendererGroup. Its skinned sibling
has carried the pragmas since 07-16; this one was simply missed, and murk
hides the symptom (CLAUDE.md: "a dark-lit screenshot MASKS material
bugs"). Added #pragma target 4.5 + multi_compile DOTS_INSTANCING_ON +
UNITY_SETUP_INSTANCE_ID, and a DepthOnly pass so the glows stop being
absent from the URP depth texture (soft particles / SSAO / DoF punch
straight through them otherwise). Verified: shader compiles, isSupported,
2 passes, 0 messages.

M7 — EnemyRigTools was dead at EVERY entry point. All eight hard-coded
prefab paths were deleted by DR-051, and the template check ran BEFORE
the idempotent in-place branch, so even re-running a builder on an
existing prefab failed. The three shipping skinned creatures were
unreproducible. Now the template only matters when there is no output to
edit in place, and a new creature templates off the shipping EnemyDrowner
ghost (GhostTemplate) instead of the deleted Enemy.prefab. Retired the
four menu items that drove the deleted Werewolf/Kaiju/Charger bestiary
rather than leave them advertising entry points that cannot work.

Deleted 19 materials with zero references from any scene, prefab,
ScriptableObject, script or settings asset — verified three ways, not
from the audit's list. Kept everything with a live reference, including
several the audit's asset-only scan called dead but which code loads by
path (M_Skinned_Palette, PixelOutline, M_Env_Fallback).

NOT fixed here, deliberately: MakeMat still points each creature at a
per-PACK Synty atlas rather than the shared palette. That is a visual
decision about the shipping Drowner/Grindylow, not a mechanical fix — the
doc-vs-reality gap gets reconciled in Art_Direction_Lantern instead.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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