chore: promote develop to main

[Teeldinho]

Issue

Develop contains the merged structural-lint guardrails and runtime warning-path cleanup that now need to be promoted to main.

Solution

• Promote the latest develop changes into main.
• Include blocking structural-lint enforcement, root ast-grep config, Convex AI guidance updates, and runtime/test warning-path stabilization.

Screenshots

N/A — tooling, guidance, and runtime warning-path changes only.

Testing

Structural-lint fixtures cover valid and invalid examples for the new ast-grep rules.

Regression coverage was added for warning-path behavior around GLTF preloading, Three.js test setup, haptics, and interaction prompts.

The branch passed local quality gates before the develop merge.