yurekami 4b7df5710a Add compatibility notes and docs links to MTP/PCP error messages
- Add documentation links to MTP and PCP error messages for consistency
  with DCP error message
- Add notes indicating no backends currently support these features
- Remove suggestion to use --attention-backend for PCP since no
  backends support it yet

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: yurekami <yurekami@users.noreply.github.com>
2025-12-25 04:10:07 +09:00
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