fix(telegram): strip existing bold markers in table conversion to prevent overlapping HTML tags

Table cells already containing **bold** markers got double-wrapped,
creating ****text**** which produced overlapping <b><i> tags rejected
by Telegram's HTML parser.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/gateway/telegram/telegram-format.ts

@@ -68,8 +68,9 @@ function convertTableBlock(tableLines: string[]): string {
     if (cells.length === 0) continue;
 
     const parts: string[] = [];
-    // First column as bold title
-    parts.push(`**${cells[0]}**`);
+    // First column as bold title — strip existing ** to avoid double-wrapping
+    const title = cells[0]!.replace(/^\*+|\*+$/g, "");
+    parts.push(`**${title}**`);
     // Remaining columns as "Header: Value"
     for (let j = 1; j < Math.min(headers.length, cells.length); j++) {
       const val = cells[j]?.trim();