https://gitlab.synchro.net/main/sbbs/-/commit/0fb29ed0d4f7b087aa172241
Modified Files:
src/doors/termgfx/sixel.h termgfx_termio.c
Log Message:
termgfx: refresh sixel palette-mode comments for the tri-state

Comment-only cleanup following the SIXEL_PAL_NONE/FULL/USED tri-state
that replaced the old 0/1 boolean:

- termgfx_termio.c: the g_rgbx_pal scratch comment said emit_pal is
"always 1"; present_rgbx() actually always passes SIXEL_PAL_USED
(the used-colour subset), so say that instead.
- sixel.h: sixel_encode()'s doc comment said "pass zero otherwise",
predating the tri-state; reworded to name SIXEL_PAL_NONE.
- termgfx_termio.c: the full-frame emit_pal assignment had two
stacked, overlapping SyncTERM-rationale comment blocks (an older
"persists sixel color registers" block immediately followed by a
newer "FULL only on a real palette change" block covering the same
ground). Merged into one concise block; no content lost.

No code lines touched.

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

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