Fix inline callout regex and li rendering for markdown links

[Mpdreamz]

Why

PR #3324 added support for inline Markdown in automatic callouts, but CI started failing on main after merge. The MathInlineAnnotation regex excluded / from callout comment text, so any comment containing a link (e.g. [link](path/to/file.md)) was silently skipped and no callout list was generated. The test for this had been passing spuriously because ShouldContainHtml had a separate bug comparing actual HTML to itself (fixed in #3346) — once that was fixed, the real failure became visible.

What

• Remove / from the [^""#] exclusion in MathInlineAnnotation so callout text can contain forward slashes (needed for Markdown link syntax like [text](path/file.md))
• Fix EnhancedCodeBlockHtmlRenderer to emit <li> and its inline content without an intermediate newline (Write instead of WriteLine), matching the HTML structure the test asserts

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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Plan: Enterprise

Run ID: 553700a7-b1ee-4a39-af08-55f287deb57f

📥 Commits

Reviewing files that changed from the base of the PR and between f6de2c5 and fc58dcd.

📒 Files selected for processing (2)

• src/Elastic.Markdown/Myst/CodeBlocks/CallOutParser.cs
• src/Elastic.Markdown/Myst/CodeBlocks/EnhancedCodeBlockHtmlRenderer.cs

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📝 Walkthrough

Walkthrough

This pull request enables inline code callout annotations to use slash-containing identifiers. The regex pattern in CallOutParser is relaxed to permit forward slashes after the // or # marker, allowing identifiers like //path/to/feature. The corresponding HTML renderer adjusts whitespace handling to emit cleaner inline callout markup by writing opening tags and content on the same line before the closing tag.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main changes: fixing the inline callout regex to allow forward slashes and correcting the li rendering for markdown links.
Description check	✅ Passed	The description clearly explains the root cause (regex excluding /), the impact (markdown links being skipped), and the fixes applied to both the regex and HTML renderer.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch fix/inline-callout-regex-and-rendering

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