docs migration - LLDB / Debugger

Source: documentation/lldb/index.md
Proposed disposition: Needs determination — content covers the LLDB debugger and Swift REPL. Could migrate to language-guides/LanguageGuides.docc, to a future compiler-focused catalog, or be deprecated in favor of linking to LLDB's own documentation.
Reviewer: @swiftlang/language-steering-group

Note: The _playground-support.md include file is incorporated into this page and should be handled as part of the same decision.

Checklist

• Create a GitHub issue to track this migration once destination is confirmed
• Determine disposition and choose explicit destination
• Review source content for accuracy against current LLDB and Swift REPL capabilities
• Decide how to handle the _playground-support.md include content (incorporate inline or as a separate article)
• Translate Jekyll markdown to DocC markdown format (if migrating)
  • Remove YAML front matter
  • Inline content from _playground-support.md or create a separate article
  • Convert any Jekyll callouts to DocC-style callouts
  • Verify all LLDB command examples against current LLDB release
• Add article(s) to target catalog's Documentation.md
• Run swift package generate-documentation --analyze --warnings-as-errors in the target package
• Preview locally with swift package --disable-sandbox preview-documentation
• Submit PR for appropriate team review
• After merge and publication: add redirect_to: in the swift.org source file's front matter
• Submit redirect PR to swift-org-website

Start by reviewing documentation/lldb/index.md and the included _playground-support.md, then determine the destination with the language-steering-group reviewer. If migration is chosen, translate the content to DocC, add it to the target catalog's Documentation.md, and run swift package generate-documentation --analyze --warnings-as-errors plus the local preview command; completion also requires the source redirect and a swift-org-website PR.