chore(lint): type JSON-parsed task data in a2a-server

[Eswar809]

Summary

Part of the linter hygiene epic (#19440), which calls out unsafe assignments as a target. This eliminates four @typescript-eslint/no-unsafe-assignment suppressions in the a2a-server persistence/restore paths by typing the values deserialized from JSON instead of leaving them as any.

Changes

• commands/restore.ts — annotate the parsed checkpoint as unknown; it is immediately validated by a Zod safeParse, which already accepts unknown. No new suppression.
• persistence/gcs.ts — type the loaded task metadata as PersistedTaskMetadata (consistent with the existing as PersistedTaskMetadata usage elsewhere in the same file) and reuse the existing getContextIdFromMetadata helper to read the context id in a type-safe way.

Net result: four no-unsafe-assignment suppressions removed, one no-unsafe-type-assertion added in gcs.ts.

Behavior

Unchanged for the documented metadata shape — _contextId is always written as a string (see agent/executor.ts), and getContextIdFromMetadata returns it directly. For malformed/non-string values it now falls back to a fresh uuidv4() instead of propagating a non-string, which is slightly more robust.

Testing

• eslint clean on both files
• tsc --noEmit passes for @google/gemini-cli-a2a-server
• Existing unit tests pass: gcs.test.ts (12) and restore.test.ts (6)

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing type safety within the a2a-server by addressing unsafe assignments during JSON deserialization. By explicitly typing parsed data and utilizing existing validation helpers, the changes reduce reliance on 'any' types and suppressions, contributing to the ongoing linter hygiene epic.

Highlights

• Type Safety Improvements: Replaced 'any' types with 'unknown' or explicit interfaces for JSON-parsed data to improve type safety and comply with linter rules.
• Linter Hygiene: Removed four instances of '@typescript-eslint/no-unsafe-assignment' suppressions across the persistence and restore paths.
• Robust Metadata Handling: Integrated the 'getContextIdFromMetadata' helper to ensure type-safe access to context IDs, improving robustness for malformed metadata.

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[github-actions]

📊 PR Size: size/S

• Lines changed: 17
• Additions: +9
• Deletions: -8
• Files changed: 2

[gemini-code-assist]

Code Review

This pull request improves type safety and cleans up ESLint disable comments in the a2a-server package. In restore.ts, parsed JSON is now typed as unknown before schema validation. In gcs.ts, explicit type assertions and the getContextIdFromMetadata helper are introduced to avoid unsafe assignments. There are no review comments, and I have no feedback to provide.