updated Project state after milestone

STATE.md

@@ -1,3 +1,27 @@
-# Start:
+# Status
 
-Just made the repo, backed up the original game roms, still need to find actual test roms for develompment 
+## Done
+
+- Repo set up, backed up the original game ROMs to roms/backup (gitignored, stays local)
+- Got a full set of CPU test ROMs in roms/test/cpu: kevtris nestest (with reference log) plus the blargg suite (instr tests, timing, interrupts, dummy reads, reset checks)
+- Cartridge module done and working (src/cartridge.rs):
+  - iNES header parser (magic, PRG/CHR sizes, mapper, mirroring, flags)
+  - Mapper 0 (NROM) support only: 16KB PRG mirroring, 32KB direct, CHR-ROM and CHR-RAM (zeroed 8KB buffer)
+  - read_prg/read_chr/write_chr with debug_assert guards
+  - Split from_file (thin I/O wrapper) / parse_data (pure parser) for testability
+  - 8 unit tests, all passing (header, PRG mapping, error cases, CHR-RAM roundtrip)
+
+## Next
+
+- CPU (6502 core) - biggest remaining piece for this milestone
+- Then bus to connect CPU to RAM/cartridge
+- Verify CPU with nestest log diff + blargg suite before any graphics
+- GUI (egui + winit) and PPU come after the CPU milestone
+
+## Decisions
+
+- No external dependencies yet, keeping it pure std until the GUI milestone
+- GUI choice: egui + winit (decided, not yet used)
+- Scope: cartridge + CPU first, verified headless before graphics
+- Mapper 0 first, other mappers (MMC1, CNROM) implemented after CPU works
+- Test ROMs are homebrew/open, no ethics issue; game backups stay in gitignored roms/backup