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chore(licence): finish PMPL→MPL-2.0 migration + Quantum-Safe supplement #196

Job	Run time
rust-ci / Detect Cargo.toml	8s
rust-ci / Cargo check + clippy + fmt	5s
rust-ci / Cargo audit (security)	-1s
rust-ci / Coverage (tarpaulin + codecov)	-1s
rust-ci / Cargo test	-1s
	10s