fix: pin a dated nightly toolchain for reproducible builds

[JoshuaBearup]

Fixes #12.

Pins nightly-2026-07-01 (rustc 1.98.0-nightly, f46ec5218) instead of bare nightly, so every host builds with the same compiler and toolchain drift stops being a suspect for new build failures. Bump the date deliberately when you want a newer nightly.

Verified: cargo check --workspace green on x86_64 Linux under exactly this toolchain, in combination with the libyggd re-lock (#13) — the lock at 697f6d2 fails on Linux on any nightly, so Linux verification requires both. On macOS this pin is safe standalone.

If nothing still requires nightly features, pinning a stable release would be even better — happy to rework the PR to stable if you prefer.

Summary by CodeRabbit

• Chores
  • Updated the project to use a specific Rust nightly toolchain version for more consistent builds.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 12154dcb-b36b-4b44-be55-003e82e4966f

📥 Commits

Reviewing files that changed from the base of the PR and between 39bf32b and 32b45b0.

📒 Files selected for processing (1)

• rust-toolchain.toml

---

📝 Walkthrough

Walkthrough

The rust-toolchain.toml file is updated to pin the Rust toolchain to a specific dated nightly version, nightly-2026-07-01, replacing the previous generic nightly channel reference.

Changes

Toolchain Pinning

Layer / File(s)	Summary
Pin dated nightly version rust-toolchain.toml	Toolchain channel changed from generic nightly to nightly-2026-07-01 for reproducible builds.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Related issues: #12

Suggested labels: dependencies, toolchain

Suggested reviewers: tomWhiting

🐰 Poem

A nightly drift, a build gone strange,
Now pinned in time, no more to range.
One date to rule the compiler's fate,
Nightly-two-six, oh-seven, eight—
No wait, oh-one! The rabbit hops in tune,
Reproducible builds beneath the moon. 🌙

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: pinning a dated nightly toolchain for reproducible builds.
Linked Issues check	✅ Passed	The PR satisfies #12 by replacing bare nightly with a dated nightly pin in rust-toolchain.toml.
Out of Scope Changes check	✅ Passed	The change is narrowly scoped to the toolchain pin and adds no unrelated modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}