fix(comark): preserve nested markup when stringifying del

[farnabaz]

Summary

• Recurse into del children in renderMarkdown (like strong/em) instead of flattening with textContent, so nested inlines such as ~~\x`~~` round-trip correctly
• Emit del attributes after the closing ~~ delimiter
• Treat del as an inline tag in HTML stringify so output stays on one line
• Add SPEC coverage for nested code in del and for del attributes

Fixes #266

Test plan

• pnpm vitest run test/index.test.ts in packages/comark (656 passed)
• Confirm ~~\x`parses and stringifies back to`x`~~`
• Confirm ~~*x*~~{.gone} round-trips attributes and nested emphasis

[vercel]

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Project	Deployment	Actions	Updated (UTC)
comark	Ready	Preview	Aug 26, 2026 2:58pm
comark-json-render	Ready	Preview	Aug 26, 2026 2:58pm
comark-nextjs	Ready	Preview	Aug 26, 2026 2:58pm
comark-nuxt	Ready	Preview	Aug 26, 2026 2:58pm
comark-svelte	Ready	Preview	Aug 26, 2026 2:58pm
comark-sveltekit	Ready	Preview	Aug 26, 2026 2:58pm
comark-twoslash	Ready	Preview	Aug 26, 2026 2:58pm
comark-vue	Ready	Preview	Aug 26, 2026 2:58pm

[pkg-pr-new]

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comark

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@comark/angular

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@comark/ansi

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@comark/html

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@comark/nuxt

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@comark/react

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@comark/svelte

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@comark/vue

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commit: 092f510

[github-actions]

✅ Bundle snapshot updated

Committed the new snapshot as 092f510, verified by re-running the bundle check against it.

GitHub suppresses the events a workflow commit would normally raise, so the ci check above may
still show the earlier failure. Re-run it to refresh the status — the snapshot itself is confirmed green.

_{Produced by this run.}