chore: integrate lefthook & commitlint

[artus9033]

This PR:

• integrates lefthook and commitlint to lint commit messages, typecheck & lint files
• lefthook will lint in fix mode (i.e., rewrite) files on pre-commit to ensure no non-aligned formatting is committed
• typecheck so far would not pass due to invalid type imports from react-native (was: CodegenTypes.js from Flow, is: CodegenTypesNamespace.d.ts - proper type declarations), which has been addressed

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Project	Deployment	Actions	Updated (UTC)
ai	Ready	Preview, Comment	Jul 3, 2026 7:45pm

[Copilot]

Pull request overview

This PR adds repository-wide Git hooks via Lefthook (pre-commit and commit-msg) and introduces a Commitlint configuration for conventional commit enforcement, while also updating React Native codegen type imports to align with the current TypeScript declaration paths.

Changes:

• Add Lefthook installation and a lint:fix script, and configure hooks to auto-fix staged files and run typechecks pre-commit.
• Add Commitlint configuration to enforce conventional commit messages on commit-msg.
• Update React Native internal codegen type imports from CodegenTypes to CodegenTypesNamespace to restore typecheck compatibility.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/mlc/src/NativeMLCEngine.ts	Updates RN codegen type import path to CodegenTypesNamespace.
packages/apple-llm/src/NativeAppleSpeech.ts	Updates RN codegen type import path to CodegenTypesNamespace.
packages/apple-llm/src/NativeAppleLLM.ts	Updates RN codegen type import path to CodegenTypesNamespace.
packages/adk/src/NativeAdkEngine.ts	Updates RN codegen type import path to CodegenTypesNamespace.
package.json	Adds Lefthook install on prepare and introduces lint:fix; adds Lefthook devDependency.
lefthook.yml	Defines pre-commit (eslint --fix + typecheck) and commit-msg (commitlint) hooks.
commitlint.config.js	Adds conventional Commitlint configuration.
bun.lock	Locks Lefthook dependency resolution.

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[grabbou]

Looks good to me. The type import fix is consistent, CI is green, and the lefthook config validates.