mzd: add --show-cycles flag for per-instruction T-state annotation

[oisee]

Description

mzd --analyze provides recursive descent disassembly with labels and cross-references, but doesn't annotate instructions with their T-state costs. A --show-cycles flag would add cycle counts as comments after each instruction.

Desired output

; ---- sub_8000 ($8000) ----
8000: 3E 02       LD A,$02           ; 7T
8002: D3 FE       OUT ($FE),A        ; 11T
8004: 76          HALT               ; 4T

Options

Could be:

• --show-cycles — dedicated flag
• Part of --analyze output by default
• Separate output format --format cycles

Context

We want to validate T-state annotations in book chapter examples ("Coding the Impossible" — Z80 demoscene book). Having mzd annotate instructions with cycles would let us diff against hand-written cycle comments in the book's .a80 files.

Note

The T-state data is already in the emulator (mze), so the instruction timing tables exist. This is about exposing them through the disassembler output.