Promote Xevious (U) and Zanac (U) from _wip/ to NROM/

- Xevious (U): Promoted from _wip/NROM/Xevious (U)/ to NROM/Xevious (U)/
  - Pass 3 complete: 34.5% code coverage, 143 semantic entry points,
    4 named data tables, ~20 semantic ZP aliases
  - NROM mapper 0, 32 KB PRG, 8 KB CHR, horizontal mirroring

- Zanac (U): Promoted from _wip/UNROM/Zanac (U)/ to NROM/Zanac (U)/
  - Pass 3 complete: 34.5% code coverage (bank 7 only), 133 semantic
    entry points, 26 named data tables, 14 semantic ZP aliases
  - UNROM mapper 2, 128 KB PRG (8 banks), no CHR
  - Bank 7 fixed at CPU -; banks 0-6 switchable at 000-
  - Bank 7 assembled separately as prg.07.s with .org

Both projects build byte-identical. Updated root README.md inventory,
per-project details, and WIP.md accordingly.

Move Zanac (U) to UNROM/ mapper directory

Zanac (U) is a UNROM (mapper 2) game, not NROM (mapper 0). Move it to
the correct mapper directory and update README.md and WIP.md references
accordingly. Update project counts in WIP.md (857->856 total, UNROM
98->97 projects).

Promote Mermaids of Atlantis (U) from _wip/ to MAPPER8/

Additional cleanup of Mermaids of Atlantis

_wip/MAPPER8/Mermaids of Atlantis (U)/README.md

@@ -2,9 +2,9 @@
 
 ## Status
 
-**Pass 0 skeleton.** The project builds and verifies byte-identical to the
-original ROM, but no disassembly exists yet: `prg.s` is a single
-`.incbin "prg.bin"` of the PRG image.
+**Pass 1 complete.** The code/data split has been produced by `nesdis.py` and
+the project builds byte-identical to the original ROM. `prg.s` now contains
+traced code with audit comments and `.byte` data blocks for unreached bytes.
 
 `make` assembles `header.s`, `prg.s`, `chr.s`, links them with `ld65` and compares the
 result against `rom.nes`:
@@ -39,11 +39,6 @@ Byte-identical ROM verified.
 
 ## 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
@@ -54,7 +49,7 @@ Byte-identical ROM verified.
 
 | File | Purpose |
 |------|---------|
-| `prg.s` | Pass 0 PRG include (replaced by the Pass 1 disassembly) |
+| `prg.s` | Pass 1 PRG disassembly (traced code + data blocks) |
 | `header.s` | iNES header include |
 | `chr.s` | CHR include |
 | `prg.bin` | 65536 bytes (64 KB) PRG image |
@@ -62,5 +57,5 @@ Byte-identical ROM verified.
 | `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) |
+| `locals.inc` | zero-page aliases (5 ZpXX aliases at Pass 1) |
 | `Makefile` | build and byte-identity check |