chore(meta): untrack spike binaries — local-only per D-241

416 binary files (~1.7 GB: .glb/.gltf/.bin/.png) removed from the index,
kept on disk; spikes/ keeps verdict/review markdown + spike code tracked
(61 files). .gitignore extended to cover model/texture/render binaries
under spikes/ going forward. Reproducible from purchased packs in
docs/assets/downloads/ + tracked scripts; zero markdown-embedded images
in spikes/, so no docs break. History rewrite deliberately NOT done —
recorded as out of scope in D-241. Closes fable-ous.md finding S-14.

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

.gitignore

@@ -39,6 +39,23 @@ spikes/**/*.uid
 spikes/**/*.npy
 spikes/**/*.npz
 
+# Spike binary artifacts are local-only (D-241): models, textures, renders are
+# reproducible from purchased packs (docs/assets/downloads/) + spike scripts.
+# Verdict/review markdown and spike code stay tracked. Production assets live
+# in client/assets/ after promotion, never in spikes/.
+spikes/**/*.glb
+spikes/**/*.gltf
+spikes/**/*.bin
+spikes/**/*.png
+spikes/**/*.jpg
+spikes/**/*.jpeg
+spikes/**/*.webp
+spikes/**/*.fbx
+spikes/**/*.blend
+spikes/**/*.exr
+spikes/**/*.hdr
+spikes/**/*.zip
+
 # Planet generator intermediates
 *.tmp.npz
 

governance/README.md

@@ -306,6 +306,7 @@ line in place — keep the Q-record for the audit trail rather than deleting it.
 - [D-238: Symmetric shadowcasting (Albert Ford) selected for LOS computation](decisions/perception.md#d-238-symmetric-shadowcasting-albert-ford-selected-for-los-computation) — _perception_
 - [D-239: Tile derivation contract — coarse→fine refinement chain (resolves Q-101)](decisions/architecture.md#d-239-tile-derivation-contract--coarsefine-refinement-chain-resolves-q-101) — _architecture_
 - [D-240: Registry orbit/star data is non-canonical — climate derives from a `planet_class` temperature envelope](decisions/architecture.md#d-240-registry-orbitstar-data-is-non-canonical--climate-derives-from-a-planet-class-temperature-envelope) — _architecture_
+- [D-241: Spike binary artifacts are local-only — gitignored, never tracked](decisions/process.md#d-241-spike-binary-artifacts-are-local-only--gitignored-never-tracked) — _process_
 
 ## Open questions
 

governance/decisions/process.md

@@ -88,4 +88,16 @@ How the team works: composition, naming, workflow.
 
 ---
 
-*5 decisions. Last updated: 2026-06-12*
+### D-241: Spike binary artifacts are local-only — gitignored, never tracked
+- **Date:** 2026-06-12
+- **Decision:** Binary artifacts under `spikes/` (models `.glb/.gltf/.bin/.fbx/.blend`, textures/renders `.png/.jpg/.webp/.exr/.hdr`, archives `.zip`) are **local-only**: gitignored going forward, and the 416 previously tracked files (~1.7 GB at tip) are removed from the index (kept on disk). What stays tracked in `spikes/`: verdict/handover markdown, spike code (`.py/.gd/.tscn/.gdshader`), and small config/JSON — the knowledge, not the bytes.
+- **Rationale:** Tracked spike binaries made every clone pay ~1.7 GB for prototype outputs that are reproducible from purchased source packs (`docs/assets/downloads/`, already gitignored) plus the tracked spike scripts; the weight grows with every Phase-4/5 asset spike. An audit scan (fable-ous.md S-14) found zero markdown-embedded images in `spikes/`, so untracking breaks no documentation. The repo already uses this pattern for `vendor/` and `docs/assets/downloads/`.
+- **Boundary:** Production assets are **promoted out of spikes/** into `client/assets/` (with manifest registration) and remain fully tracked there — promotion is the act that makes an asset repo-canonical. Spike outputs that matter must either be promoted or be reproducible from tracked scripts.
+- **Not included:** History rewrite. The ~1.7 GB remains in git history; purging it (filter-repo/LFS migration) is a separate, deliberately unmade decision — revisit if clone cost becomes a real problem.
+- **Raised by:** Jeroen (directive, 2026-06-12), from the fable-ous.md audit finding S-14.
+- **Dissent:** None.
+- **Cross-reference:** `.gitignore` spikes section, `docs/assets/downloads/` (purchased sources), fable-ous.md §2 S-14.
+
+---
+
+*6 decisions. Last updated: 2026-06-12*