Add panic lints to CI

[jerrysxie]

This pull request introduces stricter Clippy lint enforcement at the project level and updates how Clippy lints are handled in the CI script. The main goal is to ensure code quality by denying a wide range of lints by default, while simplifying the Clippy invocation in CI. Additionally, a specific lint is suppressed for the espi module.

Lint configuration improvements:

• Added a [lints.clippy] section to Cargo.toml to deny several categories of Clippy lints globally, including correctness, expect_used, indexing_slicing, panic, perf, suspicious, style, todo, unimplemented, unreachable, and unwrap_used.

• Added #[allow(clippy::indexing_slicing)] to the espi module declaration in src/lib.rs to suppress this lint specifically for that module.

CI configuration changes:

• Simplified the Clippy invocation in ci.sh by removing explicit lint deny flags from the command line, relying instead on the lints configured in Cargo.toml.

[Copilot]

Pull request overview

This PR adds panic-related clippy lints to the CI pipeline by configuring them in Cargo.toml rather than as command-line flags. The eSPI module is excluded from the indexing_slicing lint as noted in the PR description.

• Centralizes clippy lint configuration in Cargo.toml with 11 strict lints including panic detection and code quality rules
• Simplifies CI clippy commands to rely on the workspace lint configuration instead of explicit command-line flags
• Excludes the eSPI module from indexing_slicing lint enforcement

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
Cargo.toml	Adds [lints.clippy] section with 11 deny-level lints for panic detection, code quality, and best practices
src/lib.rs	Adds #[allow(clippy::indexing_slicing)] attribute to espi module to exclude it from the new lint
ci.sh	Simplifies clippy commands from explicit lint flags to just -Dwarnings, relying on Cargo.toml configuration
.github/workflows/check.yml	Simplifies clippy command for examples from explicit lint flags to just -Dwarnings

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[kurtjd]

It's odd that keyboard-service and thermal-service don't generate panic lint warnings here in CI (they do for me locally). Regardless could make sense to exclude them as well for the time-being since they aren't used externally.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

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