feat: Swap bmad-master and pm voice assignments

- bmad-master: en_US-ryan-high → en_US-lessac-medium
- pm (john): en_US-lessac-medium → en_US-ryan-high

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.bmad/_cfg/agent-voice-map.csv

@@ -0,0 +1,11 @@
+agent,voice
+bmad-master,en_US-lessac-medium
+analyst,en_US-kristin-medium
+architect,en_GB-alan-medium
+dev,en_US-joe-medium
+pm,en_US-ryan-high
+sm,en_US-amy-medium
+tea,en_US-kusal-medium
+tech-writer,jenny
+ux-designer,kristin
+frame-expert,en_GB-alan-medium