feat: expose deployment group external IDs in clients

[alongubkin]

Summary

• regenerate the public Platform OpenAPI schemas for deployment group external IDs
• expose ensure, exact-read, and explicit-update operations in the TypeScript SDK
• verify the build-time generated Rust SDK surface

Platform API: alienplatform/platform#239

Validation

• NODE_OPTIONS=--max-old-space-size=8192 pnpm build in client-sdks/platform/typescript
• cargo test -p alien-platform-api
• cargo test -p alien-platform-api --test deployment_group_external_id

Linear: ALIEN-440

[greptile-apps]

Greptile Summary

Regenerates the Platform SDKs to expose deployment-group external IDs.

• Adds TypeScript ensure, exact-read, and explicit-update operations with required mutation bodies.
• Includes external IDs in deployment-group request and response models.
• Extends the Rust compile-surface test to construct the explicit-update builder.
• Updates CLI construction for the expanded deployment-group request type.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains; omitted TypeScript mutation bodies are rejected during SDK validation, and the Rust surface test now covers the explicit-update builder.

Important Files Changed

Filename	Overview
client-sdks/platform/typescript/src/models/operations/ensuredeploymentgroupbyexternalid.ts	The nested ensure body is now required by both the TypeScript type and runtime Zod schema, preventing the previously reported bodyless PUT.
client-sdks/platform/typescript/src/models/operations/setdeploymentgroupexternalid.ts	The explicit-update operation requires and correctly remaps its request body before request encoding.
client-sdks/platform/rust/tests/deployment_group_external_id.rs	The compile-surface test now constructs the ensure, exact-read, and explicit-update operation builders.
crates/alien-cli/src/commands/onboard.rs	Onboarding initializes the newly generated optional external-ID field to None.

_{Reviews (7): Last reviewed commit: "test: construct validated external ID re..." | Re-trigger Greptile}

[greptile-apps]

Too many files changed for review (3000 files, 100 file limit).