chore(assets): Synty intake spike — scripts, evidence logs, verdict data (T-1089)

Bridge-C evidence spike: unitypackage extraction, rest-pose recon, garment
transplant onto the Quaternius rig (Data Transfer POLYINTERP_NEAREST), 11-body
batch fit, Godot QA scenes. Technical PASS; route nonetheless REJECTED by
product call (cost, baked body-segment modularity, style) — full trail on
T-1089. Salvage: source-agnostic transplant/batch-fit scripts (the G1-family
pipeline for any donor mesh) and the T-1090 discovery (5 body types misrender
bare). Extracted vendor payload (spikes/**/raw/) now gitignored.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitignore

@@ -55,6 +55,9 @@ spikes/**/*.blend
 spikes/**/*.exr
 spikes/**/*.hdr
 spikes/**/*.zip
+# Extracted vendor payload (reproducible from docs/assets/downloads/ archives
+# via the spike's own extraction script) — includes Unity .asset/.sk metadata.
+spikes/**/raw/
 
 # Planet generator intermediates
 *.tmp.npz