ci: add multi-platform compilation pipeline for arcade games

[seventhback777]

Summary

• compile-games.yml: GitHub Actions workflow for automated multi-platform builds (Windows x86, Linux x86, Linux ARM/RPi) with incremental compile detection and GitHub Release publishing
• compile-game.sh: improved script with ARM target handling, asset bundling into platform tarballs, C# runtime injection
• games/*/config.txt: compile commands for 2dRacer, HomemadePong, Pingpong, Runner_Dash, SkySurge, VentureAdventure, car-race
• .github/workflows/about.md, advanced-game-design-team/about.md, scripts/about.md: documentation

Test plan

• Workflow triggers on PR merge to main
• Changed games are detected and compiled
• Artifacts published to GitHub Release
• ARM build completes on RPi target

[RealH4D35]

Review for PR #253 (CI Pipeline)

Tested on: Arch Linux

Required fixes (add these upstream):

• Critical: scripts/compile-game.sh – Remove eval $command (critical security vulnerability).
  The compile-command from config.txt is executed as arbitrary shell code. This permits full command injection (RCE) during both local builds and CI, especially dangerous in pull_request_target workflows.
  Recommended fix: use safe execution (e.g. bash -c "$command" with strict parsing, or array‑based execution with whitelisting).

• Stability: scripts/compile-game.sh – Replace mkdir published with mkdir -p published to ensure idempotent builds and avoid errors on repeated runs.

Features work as expected:

• Multi‑platform compilation flow executes correctly on Arch Linux.
• C# projects correctly publish via skm dotnet publish with ARM64 handling.
• Asset bundling into compiled/ works as intended – assets are included in the final tarball.
• Explicit .csproj targeting resolves ambiguity in multi‑project games (e.g. SkySurge, 2dRacer).
• ARM runtime adjustment to linux-arm64 is functional and produces valid output.
• Release artifact generation pipeline successfully produces structured tar.gz outputs.

Minor issues (non‑blocking):

• Several config files contain Windows CRLF (^M) line endings.
• Some workflow steps suppress failures with warnings, which may allow silent build issues.
• CI logic is complex and could benefit from simplification for maintainability.

Architectural note:

• This PR significantly restructures the release system, moving from “commit binaries” to “GitHub release artifacts + reuse strategy”. The change is a meaningful improvement and appears functionally correct after local testing.

Relationship to PR #254:

• PR #254 fixes real C++ build failures in BelowTheSurface, HomemadePong, Pingpong, and car-race. Without those fixes, the new CI pipeline would fail immediately for these games. Merge PR #254 first, then rebase and merge this PR after the eval vulnerability is resolved.

Not ready to merge – the eval security issue is a blocker. Approve after a safe command execution method is implemented.