chore: add Rslint linting

[chenjiahan]

Summary

This PR adds Rslint as the repository linter so lint issues are caught locally and in CI. It adds the Rslint JS/TS recommended config, lint scripts, the VS Code extension recommendation, and a CI lint step before tests. It also cleans up the existing source issues required by the recommended rules.

[Copilot]

Pull request overview

Adds Rslint-based linting to the repo (local + CI) and updates existing TypeScript code to satisfy the recommended JS/TS rules.

Changes:

• Add @rslint/core with rslint.config.ts, plus lint / lint:write scripts.
• Add a CI lint step and VS Code extension recommendation.
• Refactor a few TS/code-style issues (typed package.json field access, non-empty catch blocks, clearer @ts-expect-error note).

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/prebundle.ts	Tightens typing around reading types fields from package.json and clarifies error-suppression comment; avoids empty catch.
src/helper.ts	Removes unused catch variables and avoids empty catch blocks per linter rules.
rslint.config.ts	Adds Rslint config enabling recommended JS/TS rule sets with basic ignores.
package.json	Adds @rslint/core and lint scripts.
pnpm-lock.yaml	Locks @rslint/core and its transitive dependencies.
.vscode/extensions.json	Recommends the Rslint VS Code extension.
.github/workflows/ci.yml	Runs pnpm lint before tests in CI.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add jiti or avoid a TypeScript lint config

Because this new config is rslint.config.ts, pnpm lint only works on Node versions with native TypeScript config loading. I checked @rslint/core's config loader: for .ts/.mts configs it uses native loading only when process.features.typescript is present (Node >=22.6) and otherwise requires the optional peer jiti; this repo has no engine pin to Node 22+ and existing tooling supports Node 20, so developers/CI variants on Node 20 will fail before linting unless jiti is added or the config is changed to .mjs.

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