Sync game settings booleans to scene data

Brings in PR #19 (Pirate game import fixes) plus README/team updates.

Conflict in script-tool/ImportBatchDialog.ts (autoResolveImports):
both sides reworked the per-import extension matching. Kept HEAD's
shared `extOf` predicate, which the rest of the function depends on
(filepath match at folderFiles.filter(extOf) and the claimed-filtered
fuzzy fallback that redeclares its own local `extMatches`). origin's
two intents are already covered on this branch: reusing a claimed model
file across multiple imports is handled by resolving filepath against
the full unfiltered list, and the no-extension-match case is skipped
naturally downstream. Added a comment recording why.

The script-tool model import hardcoded "application/zip" as the source
container for every model, forcing all files through JSZip's expandZip.
That only works for models bundled as real ZIP archives (e.g. pirate-ship
.glb files are PK\x03\x04 zips of model + textures). Raw .glb/.gltf/.fbx/
.obj files (100-cars, 3d-chess) failed with "Can't find end of central
directory" and returned {success:false} per model WITHOUT throwing, so the
script kept running, behaviors still imported, and exec reported "done".
Across a mixed library this looked like "about half the models and
behaviors silently don't import" — behaviors that reference the missing
models then appear broken downstream.

Fix: sniff the first 4 bytes and pass "application/zip" only for true
PK\x03\x04 archives, "" otherwise — so zip-wrapped models keep their exact
path and raw model files load directly with their companion files. This
matches every other loadModelFromFile caller, which lets the function
auto-detect the container.

Verified via persisted-scene introspection:
- 3d-chess: 0 -> 6/6 models + 6 model assets
- 100-cars: 0 -> 11/11 models + 11 model assets
- pirate-ship: zip path unchanged (logs confirm expandZip + texture
  overrides + convertToGlb running normally)

Also includes related in-progress OSS import work (behavior dedup,
asset-revision stability, image-derivative fallback) and the
repro-import-inspect.mjs harness used to diagnose this.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Quick start listed the Bun/Go/Node prerequisites but never said how to
install them per platform. Add a "Setting up your dev environment" section
with install steps for macOS (Homebrew), Linux (bun script + nvm + Go
tarball), and Windows (WSL2 recommended, since the npm scripts use inline
BUILD_MODE=oss env prefixes and .sh deploy scripts that don't run under
native cmd/PowerShell), plus a verify step. Cross-link with Quick start.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Reuse duplicate model assets during batch imports and report unresolved or stalled imports instead of silently skipping them.

Surface corrupt or missing persisted assets as save/load failures, stop mirroring large scene drafts into localStorage, and keep focused tests/playwright diagnostics with the change.