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Complementary Reimagined would not load through Espryt on Mali: Iris got GL_FRAMEBUFFER_UNSUPPORTED building its composite framebuffer, because colortex1 is RGB8_SNORM and colortex2 is RGB16F - three-channel formats that no real ES driver can render to (EXT_render_snorm covers R/RG/RGBA only, and the float extensions exclude the RGB forms). The frontend's probe cache diagnosed this correctly and then had nothing to offer: the NoThreeChannelRenderTarget widening machinery existed but was gated to multisample targets alone. llvmpipe turns out to refuse most of the same attachments - CI retrace stayed green only because a replay never branches on glCheckFramebufferStatus - so this was never a desktop-vs- device split, just an unlit path. The widening now applies to every color-attachable image, renderbuffers included, riding the driver-probe branch so the native format is still tried first and substituted only on refusal. One ThreeChannelWidening table owns the widened (internalformat, format, type) triple per source format - the previous per-case branches disagreed with each other and could emit an unuploadable (RGBA16F, GL_RGB, GL_BYTE) combination or widen into another three-channel format the driver refuses just the same. Uploads repack three-component client data to four with the format's own one in the alpha channel (127 is not 1 for RGB8I - the integer arms carry integer ones); readback drops the synthetic alpha, derived from the actual image being read, not the bound framebuffer, so glGetTexImage through a scratch FBO cannot be confused by an unrelated widened attachment. Stored alpha on a widened attachment is now an invariant 1.0 rather than an accident: the color-mask sync clears the alpha bit per draw buffer (glColorMaski for MRT mixes), and clears route through glClearBufferfv with alpha substituted on widened slots only - scissored clears inherit the discipline for free, integer color buffers keep their explicit integer-clear path, and glGet still answers the application's own mask. GL_DST_ALPHA blending, blits and readback therefore all see 1.0 without further interception. DriverPost grows the rows this bug earned: EXT_color_buffer_float detection (previously unreferenced anywhere) with a FAIL row when absent, the missing EXT_render_snorm row, and a three-channel- attachment row that reports one representative per widening class - graded so a half-float-only driver warns about the 32-bit float gap instead of being declared unsupported. Gates: 606/606 unit at default and with the async kill switch; full retrace, both backends - the complementary fixtures now run with the widening ACTIVE on llvmpipe and pass with a slightly better SSIM than before; ext caselist DirectGLES holds 3914/4867 with zero set drift while 54 cases move from NotSupported to genuinely passing; on the Mali-G77 device, Complementary Reimagined builds its pipeline and renders in-world through Espryt (md5-verified build), BSL still green. A new ThreeChannelAttachmentScenario pins the frontend answer - COMPLETE where it used to say UNSUPPORTED - on the real driver.