teaBinary hardcoded ~/.local/bin:$PATH. Right for tea, wrong as a habit: iris wrote the same function
with ~/.cargo/bin added, the two disagreed, and a rustup-only machine was refused a plugin its own
sidecar could build.
locateBinary asks the owner's login shell, so it knows about every directory a per-user installer
added without anyone listing them. Verified it still resolves tea from ~/.local/bin, which is the case
the comment above it was written for.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>