fix: gate TIFF sRGB decode behind Linear RAW toggle#590
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A TIFF tagged (or assumed) sRGB got degamma'd to scene-linear unconditionally, lifting shadows when the tag lied about the actual encoding (e.g. stitcher output). Linear RAW now controls this per the same neutral-decode semantics it already has for camera RAW.
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Summary
closes #589
Test plan
uv run pytest— 2385 passed, 1 skippeduv run ruff check .— cleanuv run ty check— clean on touched filestest_linear_raw_ignores_srgb_icc_tag,test_linear_raw_ignores_untagged_uint8_srgb_assumption