fix(ci): per-PR cargo-test link-OOM — serialize fast-path links + skip zero-unit-test crates

[proggeramlug]

Hotfix for #5411's fast per-PR path. It built every affected crate's unit-test binary in one unbounded-parallel cargo test --lib --bins -p ... invocation; each statically links the whole runtime, so a wide diff (a perry-runtime change → ~50 crates) linked ~50 huge binaries at once and the runner OOMed (linking with cc failed) — exactly what the FULL path avoids via CARGO_BUILD_JOBS=1. Surfaced on #5402.

• Fast path now sets CARGO_BUILD_JOBS=1 (serialize the heavy links, no OOM) and filters scope through ci_test_scope.py --with-tests (drops crates with no src/ unit tests — ~13 zero-test FFI shims in the wide case).
• New --with-tests mode validated locally; serial unit-only run for the wide perry-runtime fan-out = 37 test-bearing crates.

Validated locally: scope/has-lib/with-tests modes, and the per-crate unit tests pass (perry/perry-hir/perry-codegen/perry-runtime). The OOM was parallel-only; serial links each succeed.

Summary by CodeRabbit

• Chores
  • Version bumped to 0.5.1186
  • Optimized continuous integration workflow to prevent out-of-memory errors during per-PR test runs by serializing build steps and focusing tests only on crates with unit tests

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 9bae4f08-fe56-4a34-a6b7-d4079d1ae64b

📥 Commits

Reviewing files that changed from the base of the PR and between 22d18d2 and c51a385.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (5)

• .github/workflows/test.yml
• CHANGELOG.md
• CLAUDE.md
• Cargo.toml
• scripts/ci_test_scope.py

---

📝 Walkthrough

Walkthrough

Adds a --with-tests mode to scripts/ci_test_scope.py that scans each candidate crate's src/ directory for #[test]/#[tokio::test] attributes and prints only matching crates. The GitHub Actions cargo-test per-PR fast path is updated to use this filter and sets CARGO_BUILD_JOBS=1 to serialize link steps. Workspace version is bumped to 0.5.1186.

Changes

CI Test Scope Filter and Workflow Serialization

Layer / File(s)	Summary
ci_test_scope.py --with-tests implementation scripts/ci_test_scope.py	Adds os and re imports, compiles _TEST_ATTR regex for #[test]/#[tokio::test], implements _with_tests_mode() that loads Cargo metadata and walks each crate's src/ tree printing only crates with matching source files, and extends main() to dispatch on --with-tests.
Workflow fast-path update .github/workflows/test.yml	Sets CARGO_BUILD_JOBS=1 on the per-PR fast path to serialize linking, replaces the prior grep-only crate selection with a ci_test_scope.py --with-tests pipe, and updates surrounding comments to reflect the narrowed scope.
Version bump and changelog Cargo.toml, CLAUDE.md, CHANGELOG.md	Increments workspace package version to 0.5.1186, updates CLAUDE.md current-version metadata, and adds a CHANGELOG.md entry documenting the CARGO_BUILD_JOBS=1 and --with-tests CI changes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• PerryTS/perry#5411: Modifies the same .github/workflows/test.yml and scripts/ci_test_scope.py files to introduce the change-based per-PR scoping mechanism that this PR extends with the --with-tests unit-test-only filter.

Poem

🐇 Hoppity-hop through the crate garden bright,
I sniff out the #[test]s hidden from sight,
No integration tests fooling my nose —
Only src/ unit tests get to compile, goodness knows!
CARGO_BUILD_JOBS=1 keeps the linker in line,
OOM be gone — this CI path is fine! 🌿

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/fast-test-link-oom

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}