RtfToMarkdown

Converts an RTF document to a Markdown approximation. Tracks the bold (Command.b) and italic (Command.i) toggles and wraps body text runs in ** and _. Body-text filtering matches RtfTextExtractor: only Command.rtf, Command.pntext and Command.fldrslt destinations contribute text.

Command.par yields a paragraph break (blank line), Command.line a hard break, and Command.tab a tab. Markdown-significant characters in body text are escaped.

Character formatting is group-scoped: a snapshot of the bold/italic state is pushed at each group start and restored at the matching group end, mirroring how RTF braces scope formatting (e.g. {\b bold} resets bold at the }). Explicit \b0/\i0 toggles still mutate the current state within a group.