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[M2-GOLD-01] Golden image test infrastructure (TEST-008, canonical 1280x720 frame) - #98
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offdev
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…d of including the gtest-coupled test-support header (the CI runners have no system gtest)
… runners have no usable OpenGL 3.3 (the GL gtest suites GTEST_SKIP there), so the Linux llvmpipe lanes are the only CI lanes running the golden comparison
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ci:golden-update
…lden-update): workflow_dispatch only sees workflows on the default branch, so the PR-time reference regeneration path must live in ci-pull.yml (the dispatch workflow keeps the post-merge master path)
…se build links tools into build/bin (CMAKE_RUNTIME_OUTPUT_DIRECTORY), not build/tools/golden
…e environment): rendered by the label-gated golden-references job, extracted from its log between the GOLDEN_REFERENCE markers, in-run determinism compare failing=0 / max_diff=0
…ane job and the post-merge dispatch workflow)
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Golden image test infrastructure (M2-GOLD-01): offscreen FBO capture (new GlContext::readPixels) + the laige-golden tool (compare against committed reference PNGs with the explicit tolerance — max channel diff 2 inclusive, 0.001% pixel budget; --update regenerates references, human-approved) + the first two fixtures (the M2-SPRITE-02 1000-sprite scene and the M2-UI-02 UI scene, canonical 1280x720 frame, GL-free builders pinned by the golden_compare gtest suite) + the workflow_dispatch-only golden-update.yml that renders references on CI and prints them as base64 between log markers (the PR lane cannot upload artifacts). stb_image/stb_image_write join the pinned stb dependency; laige-api.json regenerated last (1851 -> 1852); no budgets.json entry (17). Local 4-tree Linux gate green (119/119, 119/119, 114/114, 114/114; GL-creating entries excluded per the GPU local-execution policy). NOTE: the first CI run's golden entry is expected RED (references not yet committed — the documented two-run bootstrap); references land in a follow-up commit after the human-approved golden-update dispatch.