fix: use resolvable Ajv 2020 ESM import path

[GsCommand]

Motivation

• Fix a TypeScript build error where the import ajv/dist/2020 is not resolvable in ESM environments by using the explicit ESM file path.

Description

• Replace import Ajv2020 from "ajv/dist/2020"; with import Ajv2020 from "ajv/dist/2020.js"; in src/trust.ts and leave all validation logic unchanged; the only modified file is src/trust.ts.

Testing

• Ran npm install, which failed with a 403 Forbidden error when fetching ajv, so dependencies were not installed.
• Ran npm run build, which failed due to missing dependencies/types caused by the install failure (TypeScript errors for missing ajv, ajv-formats, and Node types).
• Ran npm test, which failed because pretest runs npm run build, and the build failed for the same reason.

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Codex Task