chore: release CLI 0.10.13 with Code Core 6.5.2

[ZhiXiao-Lin]

Summary

• prepare CLI 0.10.13 and pin a3s-code-core 6.5.2
• synchronize the release workflow prerequisite with the published Core version
• document the stricter built-in tool contracts, root JSON Schema value support, governed generation timeouts, and typed transport failures

Validation

• release-state self-tests and 0.10.13 consistency check
• cargo fmt --all -- --check
• git diff --check
• resolved and compiled entirely against published crates.io dependencies
• real signed-in Kimi k3-agent contract test for generate_object with a root $ref schema
• real three-way parallel_task execution with overlapping requests, isolated child sessions, ordered results, and three successful branches