Add tests for the daemon Delete RPC handler to verify:
- Dry-run mode returns preview without actual deletion
- Error handling for empty issue IDs
- Error handling for non-existent issues
- Partial success when some issues exist and others do not
- Templates cannot be deleted (read-only protection)
- Invalid JSON args are properly rejected
- Reason field is passed through correctly
- Cascade and Force flags are accepted (documents current behavior)
All test scenarios from bd-dxtc issue are covered.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>