Migrate from optparse-applicative-fork to optparse-applicative 0.19

[Jimbo4350]

Summary

Replace optparse-applicative-fork 0.18.1.0 with upstream optparse-applicative 0.19.0.0.

Upstream has incorporated the two features that motivated the fork:

• PR #428 — prettyprinter switch (upstream 0.18.0.0)
• PR #425 — smart brief description formatting (upstream 0.19.0.0 as briefHangPoint)

Capability regressions

Two fork-specific hooks have no upstream equivalent:

• prefRenderHelp (helpRenderHelp in prefs) — the fork allowed injecting a custom renderer into all --help output. Upstream has no such hook. customRenderHelp now only covers the explicit cardano-cli help command path; --help on subcommands goes straight through optparse's built-in renderHelp.

• helpEmbedBriefDesc PP.align — the fork took a Doc -> Doc function for full control over usage line overflow. Upstream only has briefHangPoint :: Int -> PrefsMod, replaced here with briefHangPoint 35. The formatting output will differ.

Other changes

• Render.hs: remove fork-specific Ann/AnnTrace HTML tracing; simplify to customRenderHelp = renderHelp. The CLI_HELP_TRACE feature was never wired up (no annTrace call sites) so nothing functional is lost.
• Transaction/Option.hs: H.yellow/H.underline replaced with local helpers via H.annotate — upstream re-exports Prettyprinter.Render.Terminal so the capability is there, just not pre-wrapped.

Golden tests

The 492 help text golden files will need updating due to formatting differences from briefHangPoint 35 vs helpEmbedBriefDesc PP.align.

Changelog

- description: |
    Migrate from optparse-applicative-fork to upstream optparse-applicative 0.19.0.0
  type:
    - maintenance

Context

Upstream has caught up with the two IOG PRs that motivated the fork. The fork's additional hooks (prefRenderHelp, helpEmbedBriefDesc) are lost but may be worth raising with upstream if the formatting differences are unacceptable.

How to trust this PR

• Compiles cleanly against optparse-applicative 0.19.0.0
• Only removes dead code and rewires existing functionality to upstream equivalents

Checklist

• Compiles
• Golden tests updated (follow-up)