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Tranquil-Flow
c75e1a03f9
setup_path() writes the user-facing hermes shim with `cat >`, which follows existing symlinks. Older installs created `$command_link_dir/hermes` as a symlink to `$HERMES_BIN` (`venv/bin/hermes`), so re-running install.sh stomped the pip entry point with a bash shim that exec'd itself in an infinite loop. `rm -f` the link target before writing so the shim lands at `$command_link_dir/hermes` and the venv entry point is left intact. Adds a regression test that reproduces the symlink-stomp end-to-end (creates the symlink, drives the real shim-write block from setup_path, asserts the venv pip script body survives and the shim is now a regular file). Both new assertions fail on origin/main and pass with the fix. Closes #21454.