Fix #191 — probe available and resolved fonts

[sbeitzel]

Fix #191

Library

• CeolKitFonts.availableFaces(config:) -> [FontFaceInfo] (PostScript name, family, weight, style, origin, format, embeddable), in search order: registered → system (only with systemFonts) → bundled.
  • System faces are described by CoreText plus their OS/2 table rather than parsed (parsing every installed file took minutes; this takes ~3.5 s for ~880 faces). The Times/Helvetica/Courier stand-in families are also probed by name, because macOS hides Courier and Times from its font collection while a lookup by name still finds them.
• RenderedDocument.fonts: [TuneFontReport] — per tune, per drawn role: the requested FontSpec, the directive's source, the FontResolution used, the size, and a one-line summary.

%%ceolkit:fontlist [resolved|available]

• Defaults to resolved; a bad keyword is a warning (invalidFontDirective) and the directive is dropped.
• Reports as .info diagnostics (new code fontList) at the directive's line; the page is unchanged.
• Font directives are scoped, not positional, so a list in a tune (header or body) reports the fonts the whole tune is set in; one in the file preamble reports the document baseline.
• Documented in EXTENSIONS.md; CLAUDE.md's directive list updated.

ckprobe

• --fonts (no ABC file needed), --system-fonts, --font-file <path> (repeatable), and a per-tune fonts: section in the report and --json.

Tests

• FontListDirectiveTests (parser: modes, placement in preamble/header/body, malformed argument).
• FontReportTests (bundled-only list, registered and system faces, resolution reports with and without directives, per tune, preamble vs tune lists, available lists, page unchanged).
• swift test passes on macOS; the Linux leg (swift:6.3 Docker) passes with 1451 tests.

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