Start MarkdownIR code block rewrite smoke tests

[dowdiness]

Summary

• add MarkdownIR content origins for fenced code blocks
• preserve untouched fenced-code source slices during local rewrites
• add smoke tests for preserve/local/canonical rewrite behavior around code blocks

Validation

• NEW_MOON_MOD=0 moon -C examples/markdown fmt --check
• NEW_MOON_MOD=0 moon -C examples/markdown check --deny-warn
• NEW_MOON_MOD=0 moon -C examples/markdown test
• NEW_MOON_MOD=0 moon -C examples/markdown info
• inspected .mbti diff: none

Refs #333

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 29c71b6d-13a4-4f11-bebb-96d481ff0ed8

📥 Commits

Reviewing files that changed from the base of the PR and between fb84d20 and fd9a23e.

📒 Files selected for processing (2)

• examples/markdown/src/markdown_ir.mbt
• examples/markdown/src/markdown_ir_test.mbt

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch implement-333-codeblock-origin

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 40cd4fd074

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
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• Comment "@codex review".

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