Generate Go bool discriminated unions

[qmuntal]

Summary

• teach the Go generator to recognize boolean const/enum discriminator values
• generate QueuedCommandResult as a boolean-discriminated interface instead of a flattened struct
• regenerate RPC encoding so handled is preserved when marshaling and unmarshaling queued command results

Fixes #1264

Testing

• npm run generate:go
• go test ./rpc
• go test .

[Copilot]

Pull request overview

This PR updates the Go code generator to support boolean-valued discriminators in JSON-schema anyOf discriminated unions, and regenerates Go RPC types/encoding so QueuedCommandResult is modeled as a boolean-discriminated interface (preserving the handled discriminator across marshal/unmarshal).

Changes:

• Extend Go codegen discriminator detection to accept const/enum booleans (in addition to strings), including correct variant naming and switch emission.
• Regenerate Go RPC types so QueuedCommandResult becomes an interface with Handled() bool, with concrete handled/not-handled variants plus a raw fallback.
• Regenerate Go RPC JSON encoding to unmarshal/marshal QueuedCommandResult while preserving the discriminator (handled) correctly.

Show a summary per file

File	Description
scripts/codegen/go.ts	Adds boolean discriminator support for discriminated unions and improves boolean schema merging for flattened object unions.
go/rpc/zrpc.go	Regenerates QueuedCommandResult as a boolean-discriminated interface with handled/not-handled variants.
go/rpc/zrpc_encoding.go	Adds generated marshal/unmarshal support for the new QueuedCommandResult union and updates request decoding accordingly.

Copilot's findings

Files not reviewed (2)

• go/rpc/zrpc.go: Language not supported
• go/rpc/zrpc_encoding.go: Language not supported

• Files reviewed: 1/3 changed files
• Comments generated: 0

[Copilot]

Copilot's findings

Files not reviewed (2)

• go/rpc/zrpc.go: Language not supported
• go/rpc/zrpc_encoding.go: Language not supported

• Files reviewed: 1/3 changed files
• Comments generated: 3

[stephentoub]

Thanks!