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commit built ROMs alongside .ne sources

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The compiler is deterministic: rebuilding any example produces
a byte-identical ROM, verified across all 22 examples and all
four mappers (NROM, MMC1, UxROM, MMC3). That means the .nes
files are reproducible artefacts and can live next to their
sources without drift.

Benefits:

- Users can clone the repo and open any example in an emulator
  without installing a Rust toolchain or running the compiler.
- The emulator harness can trust examples/*.nes directly, so its
  CI job no longer needs a compiler build or a "compile all
  examples" loop — it just boots jsnes against the committed
  ROMs and diffs each against its golden.
- ROM diffs in PRs are now meaningful: "this compiler change
  flipped 17 bytes in hello_sprite.nes" is visible review
  signal, not hidden behind the emulator golden.

Guard rails so the ROMs don't drift from their sources:

- .gitignore no longer excludes *.nes.
- The `examples` CI job rebuilds every .ne into /tmp and fails
  loudly (with a GitHub error annotation pointing at the exact
  cargo command to rerun) if any committed ROM differs.
- scripts/pre-commit does the same check locally.
- CLAUDE.md now states that editing a .ne file requires
  rebuilding its .nes in the same commit, so future agents
  won't miss the invariant.

Total footprint: 22 ROMs, 624 KB (avg 28 KB each — most are
NROM 24 KB; two banked examples are larger).

https://claude.ai/code/session_01BcCcHi6FUmTh8jC7UgkA3A
This commit is contained in:
Claude 2026-04-13 15:12:18 +00:00
parent 43dc1ace49
commit 57faf9e36a
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26 changed files with 67 additions and 22 deletions
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