Simplify demo with an academic research design

[Revincxt]

Summary

• replace the product-style control room with a restrained academic research artifact
• reorganize the replay around an abstract, a single warehouse-maze figure, a state table, and descriptive results
• clarify that the committed trajectory is non-confirmatory and is not a held-out benchmark
• refresh metadata, social preview, GitHub Pages export assertions, and responsive interaction details

Validation

• pnpm run lint
• pnpm test
• pnpm run test:pages
• git diff --check