Add host-side games module and CLI commands; add release-binaries CI workflow

[Tesla1983]

Motivation

• Provide host-side, text-based previews of MiniOS games (ball, pingpong, d20, coin) so the Rust host CLI can simulate interactive firmware features without TFT hardware.
• Expose game commands from the REPL and validate arguments for a better developer experience.
• Add an automated workflow to build, package, and upload prebuilt Rust CLI binaries for common targets on tagged releases.

Description

• Added rust/src/games.rs implementing ball_game, pingpong_game, d20_game, and coin_game along with unit tests and a simple LCG RNG helper.
• Integrated the games into the shell by exporting pub mod games; in lib.rs and wiring commands in rust/src/shell.rs including ball, pong/pingpong, d20/dice, and coin/flip, plus a print_game_lines helper and thorough argument validation for ball.
• Added tests exercising the new game functions and CLI plumbing, and updated shell help text to list the new game commands.
• Added .github/workflows/release-binaries.yml which builds the minios binary for Linux, macOS, and Windows, packages per-OS archives, uploads artifacts, and attaches them to GitHub releases via gh on tag pushes.

Testing

• Ran cargo test for the Rust crate and the new unit tests which verify game outputs and shell command behavior, and all tests passed.
• Verified the ball command argument validation via unit tests that assert proper error messages and counts.

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