feat: add chunked variants of `parIterWithCancel` Add `parIterWithCancelChunked` functions for CoreM, MetaM, TermElabM, and TacticM that support chunking jobs into groups to reduce task creation overhead. The original `parIterWithCancel` functions remain unchanged for backward compatibility. The new chunked variants accept `maxTasks` and `minChunkSize` parameters to control parallelism. This enables PRs that use `parIterWithCancel` (like parallel library search and rewrites) to benefit from chunking by switching to the new `parIterWithCancelChunked` function with `maxTasks := 128`. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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