Improve ccache hit rate across variant builds#96
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Build same-chip variants through a canonical source+build directory so ccache sees identical paths. Variants sharing the same sdkconfig.defaults (e.g. esp32 and its OTA variants) now get 100% cache hits instead of rebuilding from scratch.
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Build same-chip variants through a canonical source+build directory so ccache sees identical paths. Variants sharing the same sdkconfig.defaults (e.g. esp32 and its OTA variants) now get 100% cache hits instead of rebuilding from scratch.