Rust

Tighten visibility of internal helpers and reduce public API surface #415

Job	Run time
Format	6s
Async Linux	5m 38s
Async Windows	9m 21s
Blocking Windows	5m 52s
Async macOS	4m 48s
Blocking Linux	2m 53s
Blocking macOS	3m 27s
Semver Checks (Serdesai Full+Linux)	1m 33s
Semver Checks (Core Async+Linux)	1m 6s
Semver Checks (Core Async)	1m 0s
Semver Checks (Agents+Models)	7s
Semver Checks (Core Blocking+Linux)	1m 8s
Semver Checks (Serdesai Full)	1m 29s
Semver Checks (Models Blocking)	10s
Semver Checks (Bubblewrap Base)	8s
Semver Checks (Core Blocking)	1m 10s
Semver Checks (Bubblewrap Blocking)	10s
Semver Checks (Bubblewrap Async)	11s
publish-crate	-1s
Format	7s
Blocking Linux	1m 25s
Async Windows	2m 50s
Blocking macOS	1m 18s
Async macOS	2m 23s
Async Linux	1m 18s
Semver Checks (Serdesai Full+Linux)	33s
Semver Checks (Serdesai Full)	36s
Semver Checks (Bubblewrap Base)	8s
Semver Checks (Agents+Models)	8s
Semver Checks (Core Blocking+Linux)	21s
Semver Checks (Core Async)	23s
Semver Checks (Core Async+Linux)	19s
Semver Checks (Core Blocking)	23s
Semver Checks (Bubblewrap Async)	6s
Semver Checks (Models Blocking)	8s
Blocking Windows	2m 8s
Semver Checks (Bubblewrap Blocking)	11s
publish-crate	0s
	55m 1s

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