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docs: promote common CLI options#4663

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MukundaKatta:codex/docs-cli-manual
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docs: promote common CLI options#4663
MukundaKatta wants to merge 2 commits into
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MukundaKatta:codex/docs-cli-manual

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@MukundaKatta MukundaKatta commented May 11, 2026

Addresses #4455.
Addresses #3445.
Addresses #3133.
Addresses #4521.

This updates CLI documentation in a few small ways:

  • promotes -q, --quiet to the short help output alongside -c, --stdout
  • keeps the README help excerpt aligned with the short help
  • clarifies that zstdmt is equivalent to the preferred zstd -T0 form
  • notes that --fast exposes the library negative compression levels
  • adds the --ultra caveat about memory use and third-party decoder compatibility to the manual

Validation:

  • git diff --check

I attempted make -C programs zstd, but this workspace path contains a space and the zstd Makefile split that path while deriving version/include paths. A symlinked rerun still reused the broken object configuration and failed at link time with missing zstd library symbols, before any runtime verification could be done.

@meta-cla meta-cla Bot added the CLA Signed label May 11, 2026
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