kernel_patch/README.md

Kernel patch: ttnn 0.78.0 PyPI wheel packaging gap

The ttnn PyPI wheel (0.78.0) ships tt_metal/fabric/impl/kernels/edm_fabric/fabric_erisc_router.cpp but omits three sibling kernel source files that FabricConfig::FABRIC_1D needs to JIT-compile its mux/relay routing kernels: fabric_router_mux_extension.cpp, fabric_router_relay_extension.cpp, fabric_router_udm_mux_extension.cpp. Both are present in the real tt-metal v0.78.0 source tree (github.com/tenstorrent/tt-metal, same tag this bundle's ttnn pin matches) -- this looks like an upstream wheel-packaging omission, not anything about this model or tt-model-manager.

These three files are vendored here byte-for-byte from that source tree and made discoverable via TT_METAL_KERNEL_PATH (an existing tt_metal env var -- see tt_metal/llrt/rtoptions.cpp -- that adds an extra kernel search directory ahead of the installed ttnn package's own tree), set in run.sh. Remove this directory and the env var once a ttnn release ships these files itself.