fix(processConcurrency): improve process concurrency count

[twlite]

This method returns an estimate of the default amount of parallelism a program should use, compared to cpus().length which returns the cpu core count.

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📝 Walkthrough

📝 Walkthrough

## Walkthrough The changes involve the modification of the `getProcessConcurrency` function in `src/shared/processConcurrency.ts`. The previous method of determining the number of available CPUs has been replaced. The old implementation relied on `os.cpus().length` with a fallback to return 1 if the count was zero. This fallback has been removed, and the function now uses `os.availableParallelism()` to directly obtain the number of available parallel processes, adjusting the return value to ensure at least one CPU is utilized. ## Changes | File Path | Change Summary | |-----------------------------------|---------------------------------------------------------------------------------------------------| | src/shared/processConcurrency.ts | Updated `getProcessConcurrency` function to use `os.availableParallelism()` instead of `os.cpus().length`, removing the fallback logic. Return value adjusted to `Math.max(1, cpuCount - 1)`. | ## Sequence Diagram(s) ```mermaid sequenceDiagram participant A as User participant B as getProcessConcurrency participant C as os A->>B: Call getProcessConcurrency() B->>C: Call os.availableParallelism() C-->>B: Return available CPU count B-->>A: Return adjusted CPU count (Math.max(1, cpuCount - 1)) ```

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📥 Commits

Files that changed from the base of the PR and between a9b1780cd892ee67cf684a7b3327f86ab0f1122c and 60694ee1da425f9a1048c78b57613b9a618d6c21.

📒 Files selected for processing (1)

* src/shared/processConcurrency.ts (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

* src/shared/processConcurrency.ts

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 75.37%. Comparing base (2ced938) to head (60694ee). Report is 5 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #143 +/- ## ========================================== + Coverage 75.29% 75.37% +0.08% ========================================== Files 36 36 Lines 1550 1547 -3 Branches 270 270 ========================================== - Hits 1167 1166 -1 + Misses 383 381 -2 ```

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[yamadashy]

Hi, @twlite Thanks for the contribution!

I wasn't aware of os.availableParallelism() - this is an excellent improvement that enables more accurate process concurrency control.

The implementation looks good, so I'll go ahead and merge this PR.