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refactor(config): migrate validation and serialization from class-transformer/ajv to Zod v4

Replace the internal validation and serialization pipeline with type-safe
Zod schemas. This is a non-breaking internal cleanup that eliminates
vulnerable transitive dependencies (ajv, reflect-metadata, class-transformer)
and guarantees absolute stability for modern runtimes like Node 25.

Existing configurations (JSON/YAML) and public Google Apps Script functions
remain 100% backward-compatible, as the Zod schemas validate the same structure,
apply the same defaults, and export the identical TypeScript type signatures.

Key updates:
- Implement Zod validation and recursive normalization in Config.ts.
- Separate action config types into a leaf module ActionConfigTypes.ts to resolve circular cycles.
- Remove emitDecoratorMetadata from tsconfig compiler options.
- Modularize the Prettier format pipeline into parallel sub-tasks.
- Implement E2E Reuse Mode via ensureTestData(), resetTests(), and SHA-256 configuration hashing.

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