fix(ci): wire sccache into the CMake compiler launcher - #7
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The sccache action only installs the binary and configures the GitHub Actions cache backend; it never hooks sccache into the compiler invocation, so builds ran uncached. Point CMAKE_C/CXX_COMPILER_LAUNCHER at sccache when it is available on PATH and print cache statistics after the build to make hits observable.
sccache-action only installs the binary and exports SCCACHE_PATH; the GHA cache backend stays off unless SCCACHE_GHA_ENABLED is set, so the cache lived on the ephemeral runner disk and never persisted across runs. Enable it at the job level so sccache uses the GitHub Actions cache service (v2) via the runner-provided ACTIONS_RESULTS_URL and ACTIONS_RUNTIME_TOKEN. Also log the compiler-launcher decision in build-sizer.sh and verify after configure that the generated compile rules actually invoke sccache, so a silently unwired launcher is visible in the CI log instead of only surfacing as zero compile requests in the stats.
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The sccache action only installs the binary and configures the GitHub Actions cache backend; it never hooks sccache into the compiler invocation, so builds ran uncached. Point CMAKE_C/CXX_COMPILER_LAUNCHER at sccache when it is available on PATH and print cache statistics after the build to make hits observable.