Stop the Hermes interpreter pin following the agent into the user's projects

The stub exports UV_PYTHON so mise builds Hermes against 3.13, which Hermes
requires and Arch's Python is past. Exported, it survived the exec into Hermes
itself and reached every command the agent shells out to. Hermes is a coding
agent that runs commands in the user's own repositories, so a `uv venv` or
`uv sync` there resolved 3.13 as well: on a project declaring
requires-python >=3.14, uv warns that the interpreter contradicts it and builds
the venv anyway.

Dropping it at the handover keeps the pin over the install, where it belongs.
mise x resolves the tool it already installed without it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Co-authored-by: Codex XHigh <noreply@openai.com>

bin/omarchy-install-hermes-cli

@@ -167,7 +167,11 @@ if ! [[ -d "\$(mise where '$tool' 2>/dev/null)/hermes-agent/lib/python$python" ]
   mise use -g --quiet --force '$tool' || exit 1
 fi
 
-exec mise x '$tool' -- hermes "\$@"
+# The pin belongs to building Hermes, not to everything Hermes then runs.
+# Exported it would reach the agent and every command it shells out to, so a
+# uv in the user's own project would resolve 3.13 there too -- uv only warns
+# when that contradicts the project's requires-python, and builds it anyway.
+exec env -u UV_PYTHON mise x '$tool' -- hermes "\$@"
 EOF
 
 chmod +x "$HOME/.local/bin/hermes"

test/shell.d/hermes-cli-test.sh

@@ -42,6 +42,7 @@ run_installer() {
 }
 
 stub_marker="# Written by omarchy-install-hermes-cli."
+python_pin="3.13"
 app_stub_body='#!/bin/bash
 exec /home/x/.hermes/hermes-agent/venv/bin/hermes "$@"'
 
@@ -207,7 +208,7 @@ chmod +x "$test_home/.local/bin/hermes"
 run_installer 0 || fail "reinstalling over our own stub succeeds"
 grep -qxF "$stub_marker" "$test_home/.local/bin/hermes" || fail "the refreshed stub still carries the marker"
 grep -q "stale template" "$test_home/.local/bin/hermes" && fail "reinstalling rewrites our own stub"
-grep -q "exec mise x" "$test_home/.local/bin/hermes" || fail "the refreshed stub is the current template"
+grep -q "exec env -u UV_PYTHON mise x" "$test_home/.local/bin/hermes" || fail "the refreshed stub is the current template"
 pass "reinstalling refreshes the Omarchy stub"
 
 # install/user/mise.sh is sourced by install/user/all.sh through run_logged,
@@ -244,3 +245,40 @@ OMARCHY_TEST_DESKTOP_INSTALLED=1 \
   bash -eE -c 'source "$1"' bash "$ROOT/install/user/mise.sh" >/dev/null 2>&1 ||
   fail "user setup survives a Hermes install that cannot finish"
 pass "user setup survives a Hermes install that cannot finish"
+
+# UV_PYTHON pins the interpreter Hermes is built against. Left in the
+# environment it reaches Hermes itself and every command the agent shells out
+# to, so a `uv` run in the user's own project resolves 3.13 there as well --
+# uv only warns that this contradicts the project's requires-python, then
+# builds the venv anyway. The stub drops it before handing over.
+leak_home="$test_tmp/leak-home"
+leak_bin="$test_tmp/leak-bin"
+leak_log="$test_tmp/leak-log"
+leak_prefix="$test_tmp/leak-prefix"
+mkdir -p "$leak_home/.local/bin" "$leak_bin" "$leak_prefix/hermes-agent/lib/python$python_pin"
+
+# A mise whose `where` satisfies the stub's probe, so the stub goes straight to
+# handing over, and whose `x` records the UV_PYTHON it was handed.
+cat >"$leak_bin/mise" <<SH
+#!/bin/bash
+case \$1 in
+  where) echo "$leak_prefix" ;;
+  x) printf '%s' "\${UV_PYTHON-}" >"$leak_log" ;;
+esac
+SH
+chmod +x "$leak_bin/mise"
+
+OMARCHY_TEST_DESKTOP_INSTALLED=0 \
+  OMARCHY_TEST_MISE_LOG="$mise_log" \
+  HOME="$leak_home" \
+  PATH="$mock_bin:$PATH" \
+  bash "$ROOT/bin/omarchy-install-hermes-cli" >/dev/null 2>&1 ||
+  fail "the installer writes a stub for the leak check"
+
+HOME="$leak_home" PATH="$leak_bin:$mock_bin:$PATH" \
+  "$leak_home/.local/bin/hermes" --version >/dev/null 2>&1
+
+[[ -f $leak_log ]] || fail "the stub reaches the command it wraps"
+[[ -z $(cat "$leak_log") ]] ||
+  fail "the interpreter pin does not follow Hermes into the commands it runs"
+pass "the interpreter pin does not follow Hermes into the commands it runs"