feat: fix CI build by pinning @types/babel__traverse for TypeScript 3.7.4 compatibility

[Copilot]

fix: #38

CI builds were failing with 40+ TypeScript compilation errors in @types/babel__traverse. The --no-lockfile flag was installing v7.28.0, which uses TypeScript 4.1+ syntax (mapped type as clauses, template literal type constraints) incompatible with the project's TypeScript 3.7.4.

Changes

• CI workflow: Replace --no-lockfile with --frozen-lockfile in all install steps
• Dependencies: Pin @types/babel__traverse@7.0.8 and @types/babel__core@7.1.7
• Resolutions: Force @types/babel__traverse@7.0.8 across all transitive dependencies to prevent nested incompatible versions
• Gitignore: Add lib/ directory

Error Example

node_modules/@types/babel__traverse/index.d.ts:302:20 - error TS1005: ']' expected.
302         [N in Node as N["type"]]?: VisitNode<S, N extends { type: N["type"] } ? N : never>;
                       ~~

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[hsluoyz]

@nodece @Shivansh-yadav13 please review