feat: wrap Markdown rendering to terminal width - #1122

Summary

• Wrap TTY Markdown prose using terminal display-cell widths.
• Keep ANSI styling and OSC 8 hyperlink sequences out of width calculations, reopening links across wrapped lines when needed.
• Indent wrapped list and blockquote continuations.
• Render tables that exceed the available width as vertical records.
• Preserve non-terminal output and add regression coverage/documentation.

Validation

• go test -parallel 8 ./...
• go build .
• staticcheck ./...
• git diff --check

The changes were reviewed through three subagent review cycles; actionable findings around tab widths and table-label boundaries were addressed.