fix(cli): pin simple_module_cli in scaffold dev deps so smpy plugins load

[antosubash]

Summary

Fixes #134 — smpy users create-admin (and every other module CLI plugin) failed No such command in fresh scaffolds.

• Root cause: simple_module_cli ships the smpy console script, but scaffolded host pyproject.toml never depended on it. So uv run smpy fell through to the globally-installed uv tool copy, whose isolated venv can't see the project's plugin entry points. The discovery code in simple_module_cli.plugins was correctly wired — it was just iterating an empty group.
• Fix: Add simple_module_cli=={FRAMEWORK_VERSION} to _APP_PY_DEV_DEPS in framework/cli/simple_module_cli/app_project.py. After smpy new myapp && make install, the project venv has its own smpy and uv run smpy users create-admin … works as advertised.
• Regression test: test_sm_new_pins_simple_module_cli_as_host_dev_dep asserts the scaffolded host pyproject pins simple_module_cli so this can't silently drift back.

End-to-end verified: scaffolded a fresh app, ran uv sync --all-packages, then uv run smpy users --help — now shows create-admin instead of No such command 'users'.

Note

Existing 0.0.12 scaffolds in the wild need either an upgrade or a manual simple_module_cli entry added to their host [dependency-groups].dev — worth a line in the 0.0.13 release notes.

Test plan

• uv run pytest framework/cli/tests/ — 106 passed
• uv run ruff format --check framework/cli/ + uv run ruff check framework/cli/ — clean
• uv run python scripts/check_file_size.py — 300-line cap OK
• End-to-end repro: scaffolded /tmp/smpy-test-myapp via smpy new --yes, ran uv sync --all-packages, verified uv run smpy users --help shows create-admin

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