Fix lint errors caused by stale ESLint cache

[Copilot]

Templates were failing lint with hundreds of TypeScript errors (unsafe-call, unsafe-member-access, etc.) because ESLint cached type information before the SDK package was built.

Changes

• Removed all .eslintcache files to clear stale type information
• Built SDK package to ensure type definitions are available before linting

The issue occurred because:

1. Templates use typescript-eslint with type-checking that requires SDK type definitions
2. ESLint cache was created before SDK build, causing TypeScript to fail type resolution
3. All SDK exports appeared as error types to the type checker

After building the SDK and clearing cache, all lint checks pass. Cache files are already gitignored, so no code changes required.

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