fix: use zod for safety check result validation

[allenhutchison]

Fixes #12958. Replaces manual JSON validation in checker-runner.ts with zod schema validation to ensure type safety and cleaner error handling.

[gemini-code-assist[bot]]

Summary of Changes

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This pull request refactors the validation logic for safety check results within the checker-runner.ts file. By adopting the zod library, the PR moves away from brittle manual JSON validation to a more robust, type-safe, and maintainable schema-based approach. This change significantly improves the reliability of parsing safety check outputs and streamlines error handling.

Highlights

• Improved Validation: Replaced manual JSON validation for SafetyCheckResult objects with zod schema validation in checker-runner.ts.
• Enhanced Type Safety: Introduced a zod.discriminatedUnion schema to ensure rigorous type checking and cleaner error handling for safety check results based on their decision field.

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[github-actions[bot]]

Size Change: -2 B (0%)

Total Size: 21.6 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	21.6 MB	-2 B (0%)
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB	0 B
./bundle/sandbox-macos-permissive-open.sb	890 B	0 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB	0 B
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB	0 B
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B

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