[codex] Avoid intrinsic sizing for RTL markdown documents

[omers-oai]

Codex:

Summary

• Replaced the RTL markdown document IntrinsicSize.Max wrapper with an internal measurement pass that uses real child measurement instead of intrinsic measurement.
• Added a generated Roborazzi preview case for a markdown table rendered with RTL compatibility enabled.
• Passed render options through the RTL behavior preview helper so the table regression path stays explicit.

Root cause

• The RTL document wrapper asked the whole markdown tree for intrinsic width. Markdown tables render through SubcomposeLayout, which cannot answer intrinsic measurement, and future subcomposed block nodes would have the same problem.

Testing

• ./gradlew :android-sample:recordRoborazziDebug :android-sample:testDebugUnitTest
• ./gradlew :android-sample:testDebugUnitTest :richtext-markdown:allTests
• ./gradlew check