refactor PGO implementation

[davidhewitt]

This changes the python wheel builds so that the monty-python client crate is no longer PGO-optimized, only the monty-runtime main binary.

At the same time I switch to use maturin's new --pgo flag to do the build.

There is a bug in maturin (not new in this PR) which I noted that the runtime is being built per-version; that shouldn't be necessary, I'll try to debug and fix upstream.

---

Summary by cubic

Refactored PGO to only optimize the monty-runtime binary with maturin --pgo, and folded runtime wheel builds into the main CI job. PGO runs on Linux x86_64, macOS aarch64, and Windows x86_64.

• Refactors

  • PGO applies only to monty-runtime; the monty-python extension builds normally.
  • Use maturin --pgo with pgo-command running monty-datatest’s new pgo-exercise to train via monty-pool test cases.
  • Removed .github/actions/build-pgo-wheel; integrated PGO into the main build with clearer artifacts (pypi_files-python-*, pypi_files-runtime-*).
  • CI builds runtime wheels for all targets; PGO is enabled on Linux x86_64, macOS aarch64, and Windows x86_64, and installs llvm-tools_preview when needed.
  • Updated make dev-py-pgo to build/install a PGO pydantic_monty_runtime wheel with maturin==1.14.1, then maturin develop the monty-python package.
  • Note: maturin currently produces versioned runtime wheels; -i is used as a workaround.

• Dependencies

  • Bumped maturin to >=1.14.1 and require Rust llvm-tools for PGO.
  • Added monty-pool to monty-datatest; set default-run to monty-datatest.

^{Written for commit 43435e7. Summary will update on new commits.}

[davidhewitt]

maturin issue reported as PyO3/maturin#3256

[github-actions]

Codecov Results 📊

✅ Patch coverage is 100.00%. Project has 40931 uncovered lines.
✅ Project coverage is 49.64%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    49.64%    49.64%        —%
==========================================
  Files          319       319         —
  Lines        81272     81272         —
  Branches    172725    172725         —
==========================================
+ Hits         40341     40341         —
- Misses       40931     40931         —
- Partials      3089      3089         —

---

Generated by Codecov Action

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[codspeed-hq]

Merging this PR will not alter performance

✅ 26 untouched benchmarks
⏩ 16 skipped benchmarks¹

---

_{Comparing dh/pgo (43435e7) with main (fe8dc5e)}

Footnotes

1. 16 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[cubic-dev-ai]

Review completed against the latest diff

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>