Re-enable subprocess coverage in .coveragerc

[endolith]

Problem

Coverage dropped from ~80% to ~61% on the master CI run without any code change.

scripts/measure_freq.py and scripts/wave_analyzer.py are tested via subprocess. That subprocess coverage was measured automatically by pytest-cov's .pth mechanism. pytest-cov 7.0.0 (Sept 2025) removed automatic subprocess measurement; it now requires coverage.py's native subprocess patching. The last successful Codecov report predates this (Dec 2024, pytest-cov 6.x); the first successful run since installed pytest-cov 7.x and script coverage collapsed to 0%.

Fix

Add [run] patch = subprocess to .coveragerc to re-enable subprocess measurement (requires coverage >= 7.10.6).

Verification

Run on this branch, scripts coverage should return to non-zero in the Codecov report.

Summary by CodeRabbit

• Chores
  • Updated test coverage configuration to include code run in subprocesses.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: a4998774-48df-4682-8592-dade1b04f27a

📥 Commits

Reviewing files that changed from the base of the PR and between 812aa30 and b8b5f0e.

📒 Files selected for processing (1)

• .coveragerc

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.

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📝 Walkthrough

Walkthrough

The coverage configuration adds a [run] section with patch = subprocess.

Changes

Coverage configuration

Layer / File(s)	Summary
Enable subprocess coverage .coveragerc	The coverage configuration enables subprocess patching during coverage execution.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: 🔵 Low · up to b8b5f

This change re-enables subprocess coverage, but it depends on CI using coverage.py 7.10.6 or newer; verify or pin that dependency before merging to avoid continued missing coverage.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: re-enabling subprocess coverage in .coveragerc.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/subprocess-coverage

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