crate-seq-registry 0.2.0

crates.io API client and cargo publish subprocess with exponential backoff.
Documentation 
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# crate-seq-registry

crates.io read API, `cargo publish` subprocess, and exponential backoff retry loop.

`CratesIoClient` queries published versions and yanked state via the crates.io
sparse index. All HTTP calls are blocking (reqwest); the sequential publish pipeline
never needs concurrency.

`backoff_publish` retries on `RateLimited` outcomes with exponential backoff: base
1 s, cap 60 s, up to 5 retries, deterministic jitter per attempt. `AlreadyPublished`
is treated as success. Any other failure stops the loop immediately.