R2: remove AU-51 bearer layer from planning/spec-writing model composites; delete retired @1 templates (dbc5efc6)
The @2 templates use CP-side verdict/WIA decompose and never read the bearer. Triggers already pin version 2. Claude-Session: https://claude.ai/code/session_01N218bERyNeLhbLmDRDvbWF
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