The MarkdownV2 format_message conversion left unescaped ( ) { }
in edge cases where placeholder processing didn't cover them (e.g.
partial link matches, URLs with parens). This caused Telegram to
reject the message with 'character ( is reserved and must be escaped'
and fall back to plain text — losing all formatting.
Added a safety-net pass (step 12) after placeholder restoration that
escapes any remaining bare ( ) { } outside code blocks and valid
MarkdownV2 link syntax.
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