Add Hypeman Resources, Build APIs to SDK

[sjmiller609]

Note

Adds two major API surfaces and wires them into the client.

• New Resources service: GET /resources with models (Resources, ResourceStatus, ResourceAllocation, DiskBreakdown, GPU-related types)
• New Builds service: create/list/get/cancel builds and stream events (SSE) with models (Build, BuildEvent, BuildProvenance, BuildStatus); multipart upload via BuildNewParams.Source
• Client updates: expose client.Resources and client.Builds
• Docs: expand api.md with Resources/Builds; README adds file upload examples and updates module org path; CHANGELOG link org normalized
• Meta: .stats.yml endpoint count 30→36

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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Early return discards error and returns nil stream

High Severity

In EventsStreaming, when id is empty, the function sets err but then does a bare return, causing the named return value stream to be nil. The error is stored in a local variable but never propagated to the caller. The intended pattern (seen in the final return statement) is to create a stream that wraps the error via ssestream.NewStream. Callers receiving a nil stream will experience a nil pointer panic when trying to use it, and have no way to detect that an error occurred.