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Root cause: compiler_check=mtime (default) invalidates the entire cache on every run because pixi installs fresh compiler binaries with new mtimes each time. The CI logs confirm 0/2579 cache hits (0.00%) despite successfully restoring a 225MB cache. Fix: set CCACHE_COMPILERCHECK=content to hash compiler binary content instead of mtime. Same compiler version = same content = cache hits. Also fix cache save strategy: use github.run_id for save keys so every build persists its ccache objects. Previously date-based keys with cache-hit guard meant the cache was only saved once per day — all subsequent compilations were thrown away. Changes: - Add CCACHE_COMPILERCHECK=content to build.yml, release.yml, build.sh - Use github.run_id in cache save keys (unique per run = always saves) - Remove date-based cache key computation step - Remove cache-hit != true guard on save step - Add ccache-build-main- fallback to release workflow restore-keys