Mid-scanline TIA write journal: capture step

Step 1 of the G-A2600-002 class-1 fix (built under G-A2600-001/AC#3 with the human-named design from verdict 4). Each TIASnap now carries the scanline write JOURNAL: up to 16 (cpu-cycle-offset, register, value) events for the visible-content registers (PF0/1/2, GRP0/1, COLUP0/1, COLUPF, COLUBK), captured by a single hook at the Atari io_write entry after TIA address normalization, staged per line, handed to the snapshot at the WSYNC strobe, cleared at…

Raw traces, ROM material, local paths, and personal data are not part of this public record.