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chore: R-16 toolchain pin + reconciliation #213

Job	Run time
rust-ci / Detect Cargo.toml	4s
rust-ci / Cargo check + clippy + fmt	30s
rust-ci / Coverage (tarpaulin + codecov)	-1s
rust-ci / Cargo audit (security)	-1s
rust-ci / Cargo test	0s
	32s