chore(rust): use stable channel

[colinaaa]

Summary by CodeRabbit

• Documentation

  • Updated Rust setup instructions for WebAssembly support.

• Chores

  • Updated Rust toolchain configuration to use the stable channel.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).
• Changeset added, and when a BREAKING CHANGE occurs, it needs to be clearly marked (or not required).

[changeset-bot]

⚠️ No Changeset found

Latest commit: d32aadc

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request updates Rust toolchain configuration by switching from a pinned version (1.92.0) to the stable channel and modifies setup documentation to install the complete toolchain instead of explicitly targeting the wasm32-unknown-unknown variant.

Changes

Cohort / File(s)	Summary
Rust Toolchain Configuration AGENTS.md, rust-toolchain.toml	Updates setup instructions from explicit wasm32 target installation to full toolchain installation; changes rust-toolchain.toml channel from pinned version "1.92.0" to "stable"

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• chore(rust): use toolchain 1.92.0 #2151: Also modifies the rust-toolchain.toml toolchain channel value, directly related to this change
• chore: bump Rust 1.88.0 #1712: Similarly edits Rust setup and toolchain configuration files with overlapping scope

Suggested reviewers

• PupilTong
• gaoachao

Poem

🦇 A stable wind now blows through Rust's domain,
No pinned versions causing constraint pain,
Full toolchains installed, targets expand wide,
The WebAssembly path opens with pride! 🌟

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the primary change: updating the Rust toolchain from a pinned version (1.92.0) to the stable channel across the codebase configuration files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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