Audit federation leakage and enforce source provenance

Add 3-seed formula-domain generalization study

Retract invalid P deltas after shared-state loader audit

Add adopted 3-seed P boundary joint deltas and formal research summary

Promote full P proxy boundary head after validation and paired-test gates

Add P-track boundary auxiliary head smoke and shared encoder integration

Publish 0.6 main 3-seed point-stroke model stack and technical model card