Warp: restore the translocation-vortex look + fix texture-scroll precision collapse (task #52)

The death/respawn "blue whirlwind" (tsphere) now matches the original cabinet
photo (capture.png): a smooth spinning lavender vortex with a bright core.

Root cause of the long-standing "radial spokes" artifact was NOT the warp code
but a general engine bug: L4D3D::SetTextureScrolling computed its texture-matrix
offset as scrollDelta * absolute_time, which grows unbounded and collapses UV
float precision -> a smooth scrolled cloud shatters into grainy radial steps.
Wrapped with fmodf(..., 1.0f) (identical under REPEAT tiling, full precision).
This also cleans the scrolling bexp beam grit and any other SCROLL material.

Visual reconstruction (verified against the real 45-vtx TSPHERE.BGF bicone,
offline-rasterized then ported):
  - view ON-AXIS (eye centred on the throat) + spin in place -> concentric rings
    (decomp FUN_00453dc4 does spin-about-local-Z + submit; the port had stubbed it)
  - bintA cloud through a WIDE lavender ramp at full contrast (drawn as SKY);
    no geometry "bands", no log-polar twist, no off-axis tornado (all discarded)
  - tessellate the 12-facet bicone smooth; isotropic + trilinear; ramp baked into
    the texture and drawn SELECTARG1(TEXTURE) to avoid double-tinting

Env knobs (BT_WARP_*) default to the verified values; BT_WARP_SELFTEST/SELFSHOT
are an off-by-default visual-verification harness (backbuffer frame dump).

Docs: new context/translocation-warp.md (geometry/material/visual/lifecycle/env);
reconstruction-gotchas.md gains the accumulated-time precision-collapse bug class;
rendering.md / multiplayer.md / decomp-reference.md / CLAUDE.md cross-linked.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

context/multiplayer.md

@@ -247,10 +247,19 @@ transition, HUD all landed since P6): console egg → mesh → RunningMission on
      player-attribute replication (SimulationState/DropZoneLocation) isn't wired (on a replicant both read
      0xCD… uninitialised — confirmed via `BT_TLOC_LOG`). Verified 2-node: on B's respawn the sphere
      COLLAPSES (scale ~100→5) then EXPANDS (→150) at the valid drop-zone origin, deduped to ≤2 active,
-     respawn cycle un-regressed, no render errors. Env gate `BT_TLOC_LOG`. REMAINING (follow-up): the
-     visual appearance (colour/translucency/size on screen) is unverified by logs — needs a live look;
-     and the AUTHENTIC peer path (see OTHERS' spheres) needs player SimulationState/DropZoneLocation
-     replication — until then the local-player sphere stands in.
+     respawn cycle un-regressed, no render errors. Env gate `BT_TLOC_LOG`.
+   - **✅ VISUAL DONE + LIVE-VERIFIED (task #52, follow-up):** the on-screen look now matches the
+     original cabinet photo (`capture.png`) — a smooth spinning lavender vortex with a bright core. The
+     full geometry/material/render authority is now **[[translocation-warp]]**; headlines: tsphere is a
+     12-facet BICONE viewed ON-AXIS + spun in place (decomp `FUN_00453dc4` Z-spin, which the WinTesla
+     port had stubbed), coloured by the `bintA` cloud through a WIDE lavender ramp, drawn as SKY. The
+     defect that hid it for the whole effort was NOT the warp code — it was a general
+     **texture-scroll precision-collapse bug** in `L4D3D::SetTextureScrolling` (offset = `scrollDelta ×
+     absolute_time` → unbounded → UV precision loss → radial "spokes"), fixed with `fmodf`; that also
+     cleans the scrolling beam grit. See [[reconstruction-gotchas]] §13. REMAINING: the AUTHENTIC peer
+     path (see OTHERS' spheres) still needs player SimulationState/DropZoneLocation replication — until
+     then the local-player sphere stands in; and confirm the COLLAPSE (death-side) warp fires on every
+     MP death path (the force-damage test logged EXPAND reliably, COLLAPSE less so).
    NOTE the respawn-cycle SIM path is separate + done: `DropZoneReply` (FUN_004bffd0) → `Mech::Reset`
    (@0049fb74) + the level-2 "translocated" cockpit alarm; `CreatePlayerVehicle` (FUN_004bfcac,
    disassembled — make+link only, matches RP analog). The sphere is a pure RENDER-side watcher on the