feat(roblox): add verifiable engine workflow and evidence gates

[Aming9303]

Submission status

The Roblox engine path, both complete benchmark games, generated Thrixel assets, imported scenes, runtime evidence, and reproducibility tooling are complete. The Thrixel Developer Program registration linked to @Aming9303 is active.

Delivered

• Roblox routing and setup for Windows, macOS, and the WSL host boundary
• required Thrixel MCP flow, grouping, validation, materials, pivots, collision, mobile budgets, moderation, and failure behavior
• Open Cloud path plus explicit Studio Importer fallback
• deterministic Studio self-test, six-view camera tour, and desktop/mobile performance sampler
• stormwatch: survival storms with a rotating lighthouse beacon
• courier-circuit: vehicle delivery loop with independently moving wheels
• editable Rojo source, built and imported .rbxlx files, generated FBX/GLB assets, textures, manifests, screenshots, videos, self-test output, and performance JSON
• 21 passing Roblox engine tests

Public evidence

Stormwatch

• Gameplay video
• Screenshots and runtime evidence
• Imported place

Courier Circuit

• Gameplay video
• Screenshots and runtime evidence
• Imported place

Remaining account-bound step

• publish both imported places as public Roblox experiences
• add both playable Experience URLs to the submission evidence

The implementation stays draft until those two public playable URLs are attached. No attempt will be made to bypass Roblox account restrictions.

Closes #3 only when marked ready.

[Aming9303]

The implementation and both editable games are complete, but the Roblox account used for account-bound validation is currently locked by Roblox's automated security checks, preventing public experience publication. Would public playable links published by an authorized collaborator or Roblox group be acceptable if this PR still includes the editable place sources, videos, Studio self-test output, and full performance evidence? I will not attempt to bypass the account restriction.

[Aming9303]

Public Roblox Experience URLs are not obtainable because new publishing accounts are being suspended by the platform. The PR already includes reproducible place files, verification videos, screenshots, self-tests, and performance evidence. Could those artifacts be accepted for evaluation in place of public Experience URLs?