[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rust (source)	stage	minor	1.88 → 1.99

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[doubleword-code]

Summary

This PR updates the Rust Docker base image from rust:1.88 to rust:1.96 in the Dockerfile. This is an 8-version minor release jump that brings security fixes (CVE-2026-5222 and CVE-2026-5223 in Cargo), stabilized APIs, and various compiler improvements.

Verdict: Ready to approve — no breaking changes detected for this codebase.

Research notes

• Fetched Rust 1.96.0 release notes: The compatibility notes include changes to #[repr(Int)] enum layout, Pin<Foo> unsize-coercion restrictions, gating of #![reexport_test_harness_main], and stricter checks on return-position-impl-trait-in-traits. None of these patterns are present in this codebase (verified via source inspection).
• The project uses edition = "2024" (Cargo.toml:line 4), which was stabilized in Rust 1.85, so both 1.88 and 1.96 support it without issues.
• Build tools installed in the Dockerfile (sccache ^0.7, cargo-chef ^0.1) are versioned independently and should work with Rust 1.96.

Suggested next steps

1. Merge as-is — this is a routine security and maintenance update.
2. Consider running the build pipeline once after merge to confirm the new toolchain produces working binaries (standard practice for any compiler upgrade).

General findings

No issues found. The change is minimal (single line), low-risk, and provides security benefits from the Cargo CVE fixes.