`--package-installer` silently ignored in two commands and unusable as documented on click >= 8.2

[samperman]

--package-installer was added in #708 (c1450c57). It does not work as documented in two independent ways. Neither is visible to the current test suite.

1. write-manifest <framework> and deploy quarto accept the option and ignore it

Two code paths take package_installer and never forward it to Environment.create_python_environment:

• _write_framework_manifest in rsconnect/main.py, shared by write-manifest streamlit|dash|bokeh|panel|shiny|api|fastapi. The call passes requirements_file, override_python_version, and python, but not package_manager.
• deploy_quarto in rsconnect/main.py. Same omission in its create_python_environment call.

The other commands added in #708 (deploy notebook|voila|<framework>, write-manifest notebook|voila|quarto) do pass package_manager=package_installer. git log -S "package_manager=package_installer" -- rsconnect/main.py returns only #708, so these two sites were never wired rather than wired and later lost.

Repro on click 8.1.8 (the version in uv.lock; see issue 2 for why the version matters):

$ rsconnect write-manifest shiny --overwrite --package-installer uv ./app
Checking arguments...                            [OK]
Inspecting Python environment...                 [OK]
Inspecting Shiny for Python app...               [OK]
Creating manifest.json...                        [OK]
$ python -c "import json; print(json.load(open('app/manifest.json'))['python']['package_manager'])"
{'name': 'pip', 'version': '26.2.1', 'package_file': 'requirements.txt'}

Expected {'name': 'uv', ...}. The command exits 0 with no warning.

Consequence: deploy <framework> honors the option and write-manifest <framework> does not, so write-manifest followed by deploy manifest installs differently from the equivalent direct deploy.

2. The documented uv spelling is rejected on click >= 8.2

The option is declared as type=click.Choice(PackageInstaller) over a StrEnum. click 8.2.0 changed Choice to match enum members by name instead of by value, so the accepted spelling flips with the click version:

click	--package-installer uv	--package-installer UV
8.1.8	accepted	rejected
8.2.1	rejected	accepted
8.3.1	rejected	accepted

On click 8.3.1:

$ rsconnect write-manifest shiny --overwrite --package-installer uv ./app
Error: Invalid value for '--package-installer': 'uv' is not one of 'PIP', 'UV'.

The changelog documents --package-installer=uv|pip. pyproject.toml declares click>=8.0.0 with no upper bound, so a fresh install today resolves a click where the documented invocation fails. On those versions --help also advertises the choices as PIP|UV, disagreeing with the changelog. No single spelling works across the declared click range.

This works in the repository checkout only because uv.lock pins click 8.1.8.

Why neither shows up in CI

grep -rn "package_installer" tests/ returns nothing. #708's tests cover the bundle writer at the unit level and never invoke the CLI option. Issue 1 is invisible to those tests, and issue 2 cannot appear while the lock holds click 8.1.8.

Suggested fixes

1. Pass package_manager=package_installer in the create_python_environment calls in _write_framework_manifest and deploy_quarto.
2. Declare the option as click.Choice(["pip", "uv"]) and convert to PackageInstaller afterward, so the lowercase spelling works on every supported click. Bounding click would also work, at the cost of what users can install alongside.
3. Add a CLI-level test that asserts manifest["python"]["package_manager"]["name"] for write-manifest and deploy across the app-mode families.

Environment

• rsconnect-python 1.31.2.dev1 (main, 3d3f5841)
• click 8.1.8 (from uv.lock) and click 8.3.1 (fresh resolve)
• Python 3.12, macOS