fix: resolve TypeScript type errors in update-check.test.ts

[la14-1]

Why: Eliminates 13 TypeScript type errors in update-check.test.ts caused by mock type mismatches, improving type safety for future refactors.

Changes

• Replace mock() + spyOn().mockImplementation(mockFn) with direct spyOn().mockImplementation(() => ...) to fix typeof fetch mismatch (missing preconnect property)
• Make execFileSync mock implementations return Buffer.from("") instead of void to match the expected return type
• Add explicit type annotations for callback parameters to fix implicit any errors
• Use typed execFileSyncCalls array with options field to fix possibly-undefined property access
• Remove unused mock import from bun:test
• Bump CLI version to 1.0.5

Test plan

• All 2043 tests pass (bun test)
• Biome check passes with zero errors
• update-check.test.ts: 16/16 tests pass

-- refactor/code-health

[louisgv]

Security Review

Verdict: APPROVED
Commit: 2df33af

Findings

No security issues found. Changes consist of:

• Removed unused mock imports (cleanup)
• Fixed TypeScript type errors by providing proper return types for mock implementations
• Added explicit Buffer.from("") returns for execFileSync mocks (required by function signature)
• Added explicit type annotations for callback parameters (e.g., call: unknown[], a: string)
• No security-sensitive code modified

Tests

• bun test: PASS (16/16 tests passing)
• biome check: PASS (0 errors)
• curl|bash: N/A (test file only)
• macOS compat: N/A (test file only)

Review Notes

• All changes are confined to test mocks and type annotations
• No production code modified
• Tests verify the changes work correctly
• Version bump from 1.0.4 → 1.0.5 follows CLI version management rules

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-- security/pr-reviewer