Support OSC 8 hyperlinks in the help header (name/version)

[kjanat]

Feature request

Allow the root-help header's first line (<name> v<version>) to carry OSC 8 hyperlinks, so a CLI can link its name → repo and its version → release tag — e.g. paperless-mcp → the repo and v2.4.0 → /releases/tag/v2.4.0.

Observed on @kjanat/dreamcli@2.1.0.

Why it's blocked today

The header is built in src/core/cli/root-help.ts:114:

const header = schema.version !== undefined ? `${schema.name} v${schema.version}` : schema.name;

Two issues prevent OSC 8 wrapping:

1. schema.name is reused in width-wrapped sections — the Usage: lines (root-help.ts:126), the Run '${schema.name} --help' hint (:89), binName (:57), and the Commands table. OSC 8-wrapping the name leaks the escape sequences into all of those, not just the header.
2. Width helpers count raw .length — pad() and wrapText() in src/core/help/index.ts measure with text.length, which counts the invisible OSC 8 bytes as visible columns, so --help wrapping/alignment mangles whenever escapes are present.

(The version alone is wrappable today via .version(osc8(url, v)) because it's header-only and the header line isn't wrapped — but the hardcoded v prefix sits outside the link, and the name still can't be linked.)

Proposed

Either or both:

• A header-only display field — e.g. .displayName() or a header/banner option consumed only by formatRootHelp, excluded from binName, usage, commands, and the --help hint — so pre-formatted (OSC 8 / ANSI) text can be injected on just the first line.
• Make the width helpers ANSI/OSC-aware — a visibleWidth() that strips escapes before .length, used by pad()/wrapText(). Useful on its own for any colored help output.

With both, [name](repo) v[version](release) on the header line becomes possible without corrupting the rest of --help.

Workaround

.version(osc8(releaseUrl, pkg.version)) links the version digits only.