[FEATURE] Range program: make any game from 2D cartoon to photoreal FPS buildable on jgengine

[Noisemaker111]

Parent for the 2026-09-01 range audit. Summary in docs/plans/sdk-remediation.md under "Range audit". Every sub-issue below is written as an ordered task list; each task is one PR.

Landed so far: #1692 (fixed-step ctx.sim, interpolation, replay snapshots), #1693 (PhysicsBackend seam, PhysicsWorld adapter, conformance suite, capsule controller), #1694 (animation graph), #1695 (model shadow flags, design skills installed by default).

Working order for the sub-issues (earlier ones create seams later ones reuse):

1. [FEATURE] Process: install design skills by default, require an art-direction artifact, make the visual scorecard the completion bar, add a feel gate, run the game gates #1690 process gates (cheap, catches slop in every later PR)
2. [FEATURE] Photoreal lighting seams: environment source, punctual lights, shadow flags on imported models, LUT grade, graphics profile #1680 lighting and looks
3. [FEATURE] 2D presentation path: sprite clips, textured tile layers, pixel-perfect camera, 2D framing and collision #1679 2D path
4. [FEATURE] Physics backend seam with capsule character controller and a Rapier adapter #1682 Rapier adapter and controller adoption
5. [FEATURE] Animation graph, IK, root motion, and animation events #1683 animation follow-ups
6. [FEATURE] AI seams: polygon navmesh, perception service, decision graph #1684 AI
7. [FEATURE] Real-time netcode: tick-indexed input queue, interpolation buffer, prediction and reconciliation, delta wire, session resume, RTT #1685 netcode
8. [FEATURE] Gamepad, action contexts, input feel helpers, local player slots and split-screen viewports #1686 input and local players
9. [FEATURE] Audio: spatial graph, bus sends and ducking, reverb zones, sample banks, streamed layered music, audio as an asset kind #1687 audio
10. [FEATURE] HUD skin depth, in-world SDF text, captions, and a real graphics settings surface #1688 HUD skin and settings
11. [FEATURE] Bring-your-own assets: import spec for every asset kind, editor ingest, game-defined component schemas #1689 assets and components
12. [FEATURE] First-person presentation: viewmodel layer, decals, textured particles, impact feedback #1681 first-person presentation

Rules every task follows (repeated on each sub-issue so a fresh session sees them):

• Wait for bun run agent:bootstrap --check to report ready. Branch claude/<slug> off origin/main. Post "Working on this in " on the issue first.
• One task per PR. Use .github/pull_request_template.md. Put Closes #N only on the PR that finishes the last task; earlier PRs say Refs #N.
• After adding, renaming, or removing an export: bun run gen (every new export needs a JSDoc line or gen:skill-api fails; every new create* factory needs snapshot()/restore() or check-stateful-ratchet fails).
• Add a bullet under ## [Unreleased] in CHANGELOG.md (Migrate / Changed / Added). Do not add a second ### Changed or ### Added heading; append to the existing one.
• Before pushing: bun --cwd=packages/<pkg> run check-types and run test for every touched package, plus bun run check-stateful-ratchet, bun run check-doc-symbols, bun run check-orphan-ratchet. Then git fetch origin main && git merge origin/main; if CHANGELOG.md conflicts, keep both sides.
• Rendered surface changed: bun run games:clone once, bun run shoot daemon start, then bun run shoot <game> --mode play --size half --out shots/<name>.png (games with imported models: the-robots, claudecraft, ironhold). Capture the before shot on origin/main code (stash your shell changes, shoot, git stash pop). Publish with bun run pr-shots --dir <branch> shots/*.png and paste the printed markdown into the PR. Stop with bun run shoot daemon stop.
• Open the PR ready for review, enable squash auto-merge, end the turn. Fix CI failures on the same branch.
• Never skip or disable a test, never edit Games/*, never add Kenney assets, no comments that restate code.

Acceptance for the parent: every sub-issue closed, and a 2D sprite game plus a first-person PBR game both pass jgengine-verify with no game-local renderer, physics, or audio code.