Matsumoto Kotaro 89946ebc07 graphics: make N a transient usage-hints bitmask ...

Change the graphics protocol N key from a boolean into a usage-hints
bitmask. Define the first bit as a transient hint, allowing the terminal
to treat the image data as short-lived and apply optimizations such as
skipping disk cache writes.

Propagate the transient hint through frame coalescing and composition, so
a composed frame is transient if any contributing frame is transient.

2026-06-19 13:22:01 +09:00

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