Rewrite¶

The Python + raylib implementation and the native Zig port reproduce Crimsonland Classic v1.9.93. Both have live gameplay and deterministic replay tooling. Native behavior is established from the executable and recovered source; passing port regression tests alone does not establish parity with the original.

Start with setup, coverage and scope, or Zig build and tooling.

Architecture and contracts¶

• Module map: package boundaries, screen ownership, and runtime components.
• Deterministic session: live/replay tick order, input, and presentation.
• Run startup: shared initialization, native capture boundary, and terrain RNG.
• Perks architecture: explicit effect phases and ordering.
• Rendering pipeline and terrain: drawing and decal application.
• Local multiplayer: the ¾-player extension to native ½-player behavior.
• Netplay: deferred scope and requirements for a replacement.

Parity work¶

• Original bugs: intentional fixes and --preserve-bugs behavior.
• Float policy and precision map.
• Trace contracts and CDT format.
• Differential playbook and evidence records.
• RNG caller mapping.