feat: complete BYO onboarding SDK and CLI flow

[alongubkin]

Summary

• regenerate the public Platform SDK from the onboarding API contract
• expose Deployment Link setup package readiness
• correct Release Channel operation documentation at the source and in generated clients
• update the remote-worker starter to current SDK packages and AWS/GCP/Azure targets
• make macOS cross-builds download, integrity-check, and cache only the requested published native assets

Validation

• clean starter installed outside the repository
• four remote-worker runtime tests passed
• clean starter TypeScript passed
• plain alien release created one local Platform Release for AWS, GCP, and Azure
• cargo test -p alien-build toolchain::native_addon::tests --lib
• cargo check -p alien-build
• NODE_OPTIONS=--max-old-space-size=8192 pnpm --dir client-sdks/platform/typescript build
• git diff --check

This PR is stacked on the BYO container-registry branch because the onboarding work follows projects 1–5.

[greptile-apps]

Greptile Summary

The PR regenerates the Platform SDK to expose Deployment Link setup-package readiness and correct Release Channel documentation. It also adds verified downloading and caching of target-native npm assets for external TypeScript cross-builds.

• Adds setupPackagesStatus to the generated Platform SDK contracts and documentation.
• Updates generated Release Channel operation descriptions.
• Downloads missing target prebuilds from npm with SHA-512 verification.
• Updates the remote TypeScript worker example and response validation.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains.

No blocking failure remains.

Important Files Changed

Filename	Overview
crates/alien-build/src/toolchain/native_addon.rs	Adds integrity-verified npm retrieval and caching for target-native bindings and AI gateway assets when no local workspace source is available.
client-sdks/platform/typescript/src/models/deploymentlinksetupresponse.ts	Adds the required setup-package readiness enum and field to the generated Deployment Link setup response model.
client-sdks/platform/openapi.json	Regenerates the public Platform API contract with setup-package readiness and corrected operation documentation.
examples/remote-worker-ts/tests/worker.test.ts	Adds Zod validation for health, tool-list, and file-read responses in the example integration tests.

_{Reviews (2): Last reviewed commit: "fix: make the starter release cross-plat..." | Re-trigger Greptile}

[greptile-apps]

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