fix(ci): bump Python to 3.14 and pin uv venv to setup-python interpreter

homeassistant==2026.3.4 requires Python>=3.14.2. The lint workflow was
specifying Python 3.13, and uv venv was ignoring actions/setup-python and
picking up the system Python (3.14.0) instead.

Changes:
- lint.yml: python-version 3.13 → 3.14
- bootstrap: uv venv now uses $(which python) to respect
  actions/setup-python and local pyenv/asdf setups

Impact: lint workflow no longer fails with Python version unsatisfiable
dependency error when installing homeassistant.

.github/workflows/lint.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: "3.13"
+          python-version: "3.14"
 
       - name: Install uv
         uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78  # v7.6.0

scripts/setup/bootstrap

@@ -39,7 +39,8 @@ fi
 # if no venv, create one
 if [[ ! -d $HOME/.venv ]]; then
     log_header "Creating virtual environment"
-    uv venv "$HOME/.venv"
+    # Use the Python interpreter from PATH (respects actions/setup-python or local pyenv)
+    uv venv --python "$(which python)" "$HOME/.venv"
     ln -s "$HOME/.venv/" .venv
 fi
 # shellcheck source=/dev/null