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  • docs/superpowers/plans/2026-07-22-sixel-subsetting-measurements.md

    From Rob Swindell (on Debian Linux)@VERT to Git commit to main/sbbs/master on Wed Jul 22 20:38:40 2026
    https://gitlab.synchro.net/main/sbbs/-/commit/940ee3ba6ea9c959e02c5a61
    Added Files:
    docs/superpowers/plans/2026-07-22-sixel-subsetting-measurements.md
    Log Message:
    docs: sixel subsetting byte-identity proof + README sweep

    Proves (via a real A/B harness against a pre-USED build of sixel.c)
    that SIXEL_PAL_FULL/NONE output stays byte-identical to the legacy
    encoder, so SyncTERM and any door left on FULL/NONE are untouched by
    the palette-subsetting change. Also sweeps the other doors' READMEs
    for stale palette/dirty claims -- both grep hits are still accurate
    or unrelated, so no README changes were needed. Live cross-title
    metrics (Steps 2-3) are left as a pending template for the maintainer's
    manual pass with real ROMs/terminals.

    Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

    ---
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