fix(ci): pin Rust 1.97.1, bump ethnum, clear clippy lints on current stable

[jamiepine]

CI has been red for every Rust check since stable moved past 1.93, on every PR and on main itself. Two causes stacked:

• ethnum 1.5.2 (pulled in via jsonb) fails to compile on current stable — error[E0512] on a mem::transmute(()) into TryFromIntError. Fixed upstream in 1.5.3.
• once past that, clippy on 1.97 flags 7 lints in existing code that -Dwarnings turns into errors.

Because the workflow floated on dtolnay/rust-toolchain@stable, every stable release could (and did) break all open PRs at once, while local builds on older toolchains kept passing — which is why it went unnoticed.

Changes:

• bump ethnum 1.5.2 -> 1.5.3 in the lockfile
• pin the toolchain to 1.97.1 via rust-toolchain.toml and in ci.yml, so local builds and CI compile with the same rustc/clippy and a stable release can't take down CI again
• fix the 7 clippy lints (.values() instead of iterating map tuples, Option::filter, ? operator, redundant format! ref)

Verified locally on 1.97.1: fmt, clippy --all-targets with -Dwarnings, 875 lib tests, gate-pr.

Note

Summary: Fixes CI failures by pinning Rust to 1.97.1, updating ethnum to 1.5.3, and clearing 7 clippy lints across activity, channels, workers, model, task store, and spawn_worker modules. All changes maintain existing functionality while ensuring consistent builds across local and CI environments.

_{Written by Tembo for commit d027b9d. This will update automatically on new commits.}

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