v1.15.2.0

Release 1.15.2.0 (Mar 10, 2026) -- compared to 1.15.1.0

• feat: Add more shader group diagnostics to compile_report (active layers, connection depth, texture and noise op counts) #2085
• bsdl improvements:
  • bsdl: Move GeneralizedSchlick lobe from testrender into BSDL library, unifying DielectricRefl/DielectricBoth into a single DielectricBSDF<Fresnel> template #2078 (by Alejandro Conty)
  • bsdl: Move MaterialX sheen BSDF into BSDL as mtx::SheenLobe, consolidating sheen implementations from testrender and SPI into one place #2084 (by Alejandro Conty)
  • bsdl: Clamp BSDL/MTX Fresnel inputs to [0,1] and fix bootstrap Imath link #2081 (by Alejandro Conty)
• fix: Make linearstep definitely return 1 for x > edge1 #2064 (by Roeland Schoukens)
• perf/fix: Change default JIT FMA mode to Strict (no fused multiply-add), improving cross-platform numerical consistency #2076
• testshade: Route errors through renderer's own error handler; convert raw pointers to unique_ptr #2082
• build: Support LLVM 22 / clang 22 for building #2086
• ci: Add macOS 26 (ARM) to the CI lineup #2079
• ci: Stop nightly CI workflows on user forks #2074
• ci: Fix Windows curl LLVM download failure #2089
• ci: Fix and speed up Mac CI dependency installations via Homebrew #2091
• testing: Check in ref images for Mac ARM debug case #2083
• docs: Fix typo #2077 (by Taraash)
• admin: Fix link to icon used for Slack release announcements #2070