[Feat] Pin hai-agent-runtime 0.1.19

[hai-runtime-release]

Automated pin bump from the hai release pipeline.

• Runtime version: 0.1.19
• Artifacts published under the immutable CDN prefix hai-agent-runtime/0.1.19/.

Merge and release the SDK to ship this runtime; clients pick it up by raising their hai-agents floor.

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Note

Low Risk
Checksum-only pin bump for prebuilt runtime binaries; behavior change is which runtime version ships with the SDK, not in-repo logic.

Overview
Bumps the SDK’s pinned hai-agent-runtime from 0.1.18 to 0.1.19, including updated SHA-256 checksums for darwin-arm64, windows-x86_64, windows-arm64, and linux-x86_64. Clients that install or update hai-agents will download and verify artifacts from the hai-agent-runtime/0.1.19/ CDN prefix via manifest.py.

This is an automated release-pipeline pin update; no application logic changes in this diff.

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[abonneth]

Superseded by #264 (runtime 0.1.20).