feat(ai): add partial JSON parser

[rekram1-node]

Summary

• add an attributed internal partial JSON parser
• support configurable partial strings, numbers, collections, and literals
• use Effect Schema for strict and repaired JSON decoding
• cover complete, partial, malformed, and empty inputs

Verification

• bun test test/partial-json.test.ts
• bun typecheck
• bun run build
• bunx prettier --check src/protocols/utils/partial-json.ts src/protocols/utils/partial-json-options.ts test/partial-json.test.ts