Pass 2 _wip: Slalom (U), Kung Fu (U), Othello (U) label replacement complete

Pass 3 _wip: Slalom (U), Kung Fu (U), Othello (U) semantic naming complete
Pass 3 _wip: apply symbols (0 residue) for Slalom (U), Kung Fu (U), Othello (U)
Pass 2/3 _wip: 10 NROM projects (Elevator Action, 1942, Tag Team Wrestling, Galaga, Kung Fu a1, Stack-Up, Magmax, Ms Pac-Man Namco, Soccer, Sqoon)
Promote 13 _wip/NROM projects to NROM/ (Slalom, Kung Fu, Othello, Elevator Action, 1942, Tag Team Wrestling, Galaga, Kung Fu a1, Stack-Up, Magmax, Ms Pac-Man Namco, Soccer, Sqoon)
Pass 2/3 _wip: 5 CNROM games (Tiger-Heli, Paperboy, Last Starfighter, Mighty Bomb Jack, Kung-Fu Heroes)
Docs: document CDL capture + re-trace workflow in TODO.md
Adds more code for
 - Elevator Action (U)
 - Kung Fu (U)
 - Othello (U)
 - Slalom (U)
 - Sqoon (U)

NROM/Stack-Up (JU)/README.md

@@ -0,0 +1,67 @@
+# Stack-Up (JU)
+
+## Status
+
+**Pass 3.** All address-derived `Label_XXXX` definitions replaced;
+every `jsr`/`jmp` operand symbolic; hardware-register operands resolved
+via `apply_symbols.py` (0 residue); audit comments aligned; `make`
+stays byte-identical.
+
+`make` assembles `header.s`, `prg.s`, `chr.s`, links them with `ld65` and compares the
+result against `rom.nes`:
+
+```
+Byte-identical ROM verified.
+```
+
+## ROM
+
+| Property | Value |
+|----------|-------|
+| Format | iNES |
+| Mapper | 0 |
+| Board | NROM-256 |
+| Mirroring | Horizontal |
+| Four-screen VRAM | no |
+| Battery | no |
+| PRG | 32 KB (2 x 16 KB), mapped at CPU $8000-$FFFF |
+| CHR | 8 KB (1 x 8 KB) |
+| Trainer | none |
+| Footer | none |
+| NMI vector | $81AD |
+| RESET vector | $8100 |
+| IRQ vector | $81E6 |
+| ROM file | `Stack-Up (JU).nes` |
+| SHA-256 | `3ab6bc99246783a6bf7083481027fe358ccdb147dcf1165eaf08aaf4e1b06548` |
+
+### Header notes
+
+- none
+
+## Open work
+
+- **Pass 1** - run `nesdis.py` over `prg.bin` to produce the code/data
+  split. The tracer reads the vectors from the last six bytes of the PRG
+  image, so the split seeds correctly.
+- **Pass 1** must emit the canonical audit comment
+  `; CPU:$C123 PRG:0123  AD 21 03` at column 35 for every instruction.
+- **Pass 2** - replace the address-derived `Label_XXXX` names and the raw
+  `$XXXX` call operands.
+- **Pass 3** - semantic zero-page aliases (applied only at the sites where
+  their role is proven) and named data tables.
+- **Promotion** to `NROM/<name>/` once Pass 3 is done, as `git mv`.
+
+## Files
+
+| File | Purpose |
+|------|---------|
+| `prg.s` | Pass 0 PRG include (replaced by the Pass 1 disassembly) |
+| `header.s` | iNES header include |
+| `chr.s` | CHR include |
+| `prg.bin` | 32768 bytes (32 KB) PRG image |
+| `chr.bin` | 8192 bytes (8 KB) CHR image |
+| `rom.nes` | byte-identical copy of the original ROM |
+| `linker.cfg` | HEADER / PRG / CHR memory areas |
+| `symbols.inc` | NES hardware register names |
+| `locals.inc` | zero-page aliases (empty at Pass 0) |
+| `Makefile` | build and byte-identity check |