Add --example-workers 0 to read-only doccmd hooks

[adamtheturtle]

Summary

• Add --example-workers 0 to all doccmd hooks using --no-write-to-file

Benefits

• Enables parallel processing of code blocks in documentation
• Significantly speeds up linter hooks (mypy, pyright, shellcheck, vulture, etc.)
• Auto-detects optimal worker count based on CPU cores

Details

The --example-workers 0 flag enables doccmd to process multiple code blocks concurrently when running read-only linters. This is safe because these hooks use --no-write-to-file, which means they only emit diagnostics without modifying files.

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