feat(font-system): bundle C059 and Liberation Sans Narrow

[caio-pizzol]

Bundles C059 and Liberation Sans Narrow so DocFonts 0.14 rows can render in SuperDoc.

Why:

• Enables Arial Narrow -> Liberation Sans Narrow.
• Enables Century and Century Schoolbook -> C059 for document rendering.
• Advertises Century, but not Century Schoolbook, to avoid two built-in picker names resolving to the same physical font.
• Keeps strict default offerings unchanged while adding selected qualified choices to the built-in picker.
• Expands bundled font license metadata for GPL/AGPL font exception rows.

Verified:

• pnpm check:font-licenses
• pnpm --filter @superdoc/font-system typecheck
• pnpm --filter @superdoc/font-system build
• git diff --check
• public-safety scans for em dashes and private paths

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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