chore: delete Python tree + simplify wheel/CI for pure-Rust binary

[jd]

End of the port. With every subcommand native, nothing in the
wheel needs Python anymore — the install-time mergify binary
covers the full CLI surface and clap handles unknown-subcommand
suggestions natively. Drop the whole Python superstructure in
one self-consistent change so CI doesn't briefly target a
half-deleted tree.

Deletions:

• mergify_cli/ — entire Python package (utils, cli, dym,
  exit_codes, github_types, stack/cli, init, main,
  __globals + the test suite). All functionality was already
  mirrored in the Rust crates; tests live alongside the Rust
  code they exercise (~600 tests across the workspace).
• crates/mergify-py-shim/ — the subprocess bridge that
  forwarded un-ported subcommands to Python. No un-ported
  subcommands left.
• compat-tests/ — pytest runner that diff'd Python vs.
  Rust output via python -m mergify_cli. No Python side to
  diff against.
• test_binary_build.py — verified the Python-specific
  Windows UTF-8 re-exec in cli.py::main. The Rust binary
  handles UTF-8 natively, so the test target no longer exists.
• poe.toml + requirements-uv.txt — Python toolchain
  pinning, irrelevant now.

Modifications:

• pyproject.toml:
  • Drop dependencies (httpx, click, rich, pydantic, …) and
    [dependency-groups] dev (mypy, ruff, pytest, …) — wheel
    has no Python runtime / no Python lint+test.
  • Drop [tool.maturin] python-source + module-name so
    the wheel doesn't try to bundle a package that's gone.
  • Drop [tool.pytest.ini_options], [tool.mypy],
    [tool.ruff] (long config block) — no Python to configure.
  • Keep bindings = "bin" + manifest-path so maturin still
    builds a binary-only wheel for PyPI.
  • Lower requires-python to >=3.10 — only matters for the
    metadata-side pip install resolution, not the runtime.
• crates/mergify-cli/Cargo.toml — drop mergify-py-shim dep.
• crates/mergify-cli/src/main.rs:
  • Strip the shim infrastructure: run_py_shim,
    inject_global_flags, prepend_one, and Dispatch::Shim
    are gone. The Dispatch enum kept as a single-variant
    wrapper so the match in main stays exhaustive.
  • dispatch_stack no longer takes debug (was only used by
    the shim re-injection) and its _ fallback exits via a
    synthetic StackProbeCli clap parse — that's what gives
    stack pussh clap's "did you mean push, squash?"
    formatting natively.
  • Clap parse failures at the binary's root now always exit
    via clap::Error::exit(), surfacing the same Levenshtein
    suggestions for unknown top-level subcommands (staack
    → "did you mean stack?").
  • Tests for shimmed_dispatch_* deleted — the shim is gone
    and clap's exit-on-error path can't be unit-tested without
    subprocess plumbing.
• .github/workflows/ci.yaml — drop linters, compat-tests,
  test jobs (Python lint/test). Keep rust (cargo) +
  wheels (build matrix) + a new smoke-test-binary job that
  pip installs each per-target wheel and runs mergify --help to catch a broken wheel entry on every supported OS.
• .github/workflows/func-tests-live.yaml — replace
  uv run --locked poe live-test with pip install --user pytest && python -m pytest -v func-tests/ -m live so the
  live smoke runs without the poe/uv-deps superstructure.
• NATIVE_COMMANDS — add ("stack", "push") (was missing).

End state: the wheel is one Rust binary + LICENSE; clap covers
the full CLI; PyPI publishing pipeline unchanged.

Co-Authored-By: Claude Opus 4.7 noreply@anthropic.com

Depends-On: #1553

[jd]

This pull request is part of a Mergify stack:

#	Pull Request	Link
1	feat(rust): port stack checkout to native Rust	#1522
2	feat(rust): port stack sync to native Rust	#1523
3	feat(rust): port stack list + stack open to native Rust	#1524
4	feat(rust): port stack hooks + stack setup to native Rust	#1527
5	feat(rust): port stack push end-to-end + delete Python push.py	#1553
6	chore: delete Python tree + simplify wheel/CI for pure-Rust binary	#1554	👈
7	refactor(stack): extract shared git helpers into crate::git	#1555
8	ci(workflows): align smoke-test-binary on python 3.14	#1557

[mergify]

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• depends-on=Mergifyio/mergify-cli#1522 [⛓️ feat(rust): port stack checkout to native Rust #1522 [stack]]
• depends-on=Mergifyio/mergify-cli#1523 [⛓️ feat(rust): port stack sync to native Rust #1523 [stack]]
• depends-on=Mergifyio/mergify-cli#1524 [⛓️ feat(rust): port stack list + stack open to native Rust #1524 [stack]]
• depends-on=Mergifyio/mergify-cli#1527 [⛓️ feat(rust): port stack hooks + stack setup to native Rust #1527 [stack]]
• depends-on=Mergifyio/mergify-cli#1553 [⛓️ feat(rust): port stack push end-to-end + delete Python push.py #1553 [stack]]

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• depends-on=Mergifyio/mergify-cli#1522 [⛓️ feat(rust): port stack checkout to native Rust #1522 [stack]]
• depends-on=Mergifyio/mergify-cli#1523 [⛓️ feat(rust): port stack sync to native Rust #1523 [stack]]
• depends-on=Mergifyio/mergify-cli#1524 [⛓️ feat(rust): port stack list + stack open to native Rust #1524 [stack]]
• depends-on=Mergifyio/mergify-cli#1527 [⛓️ feat(rust): port stack hooks + stack setup to native Rust #1527 [stack]]
• depends-on=Mergifyio/mergify-cli#1553 [⛓️ feat(rust): port stack push end-to-end + delete Python push.py #1553 [stack]]

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[jd]

Revision history

#	Type	Changes	Reason	Date
1	initial	0aed310		2026-06-05 08:13 UTC
2	rebase	0aed310 → 33f2759 (rebase only)		2026-06-05 08:13 UTC
3	content	33f2759 → fdab609		2026-06-05 09:38 UTC
4	content	fdab609 → e373ef9 (raw)	address jd's review: revert unintentional python-version downgrade from 3.14 to 3.13 in func-tests-live.yaml (was copy-pasted from ci.yaml's smoke-test-binary job; no reason to change here)	2026-06-05 11:15 UTC
5	rebase	e373ef9 → 341abdb (rebase only)		2026-06-05 12:37 UTC
6	content	341abdb → 34a48aa (raw)		2026-06-08 11:31 UTC
7	rebase	34a48aa → d69a6fb (rebase only)		2026-06-08 15:03 UTC