Remove obsolete Gemini and embedded showcase remnants

[ProfRandom92]

Summary

• Remove obsolete GEMINI.md
• Remove the embedded showcase/ tree from the main repository
• Update repository layout validation so showcase/app/package.json is no longer required
• Update the layout test accordingly
• Replace stale agent workflow wording around Gemini/showcase ownership
• Remove stale showcase checks from docs/reports/check-report.md

Validation

• npm run layout
• pytest tests/test_check_repo_layout.py -q
• pytest -q
• npm run check

Result:

• pytest -q: 384 passed
• npm run check: passed

Scope

Maintenance-only cleanup.

Not changed:

• dashboard UI wording
• benchmark logic
• contracts
• fixtures
• artifacts
• README positioning

Next

README/industrial-positioning cleanup should be handled in a separate follow-up PR.

[gemini-code-assist]

Code Review

This pull request removes the showcase application and its associated source files, configurations, and assets from the repository, redirecting showcase development to a separate project. Updates were made to documentation, repository layout validation scripts, and tests to reflect this change. A review comment suggests further simplifying the repository layout tests by removing redundant file existence assertions that are already covered by the main validation function.

[gemini-code-assist]

These explicit file existence assertions are redundant because check_repo_layout() already validates these exact paths (and others) as part of its REQUIRED_FILES check. Removing them simplifies the test while maintaining the same level of validation.

Suggested change

	assert (REPO_ROOT / "package.json").is_file()
	assert (REPO_ROOT / "dashboard" / "app" / "package.json").is_file()
	assert (REPO_ROOT / "showcase" / "app" / "package.json").is_file()
	assert check_repo_layout() == []
	assert check_repo_layout() == []