Add typed reply draft operation

[code-monger-givenall]

HEY already serves the reply composer as JSON, including the recipients it resolves for the selected entry. Without a typed SDK operation, clients have to scrape the HTML reply form to get that envelope.

This adds NewEntryReply for GET /entries/{entryId}/replies/new.json and exposes it as Entries().NewReply. It returns the existing MessageDraft model, so callers get the subject, sender context, and To, CC, and BCC contacts HEY prepared.

The generated client, behavior model, route artifacts, wrapper, unit test, and path conformance case are included.

Validation:

• make check
• 146 conformance cases passed

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Summary by cubic

Adds a typed SDK operation to fetch the live reply draft envelope for an entry, eliminating the need to scrape the HTML reply form. The new NewEntryReply GET returns a MessageDraft with subject, sender context, and HEY-resolved To/CC/BCC recipients.

• New API surface: NewEntryReply at GET /entries/{entryId}/replies/new.json in openapi.json and spec/hey.smithy; route added in go/pkg/hey/url-routes.json.
• Client support: Client.NewEntryReply and ClientWithResponses.NewEntryReplyWithResponse in go/pkg/generated/client.gen.go; returns MessageDraft.
• Wrapper: Entries().NewReply(ctx, entryID) in go/pkg/hey.
• Reliability: readonly GET retried on 429/503 with exponential backoff (base 1000ms, max 3).
• Tests and artifacts: path conformance case, runner support, unit test for Entries().NewReply, and behavior/coverage updates.

^{Written for commit cbb4fb7. Summary will update on new commits.}

[Copilot]

Pull request overview

Adds typed Go SDK support for fetching HEY’s prepared reply envelope and resolved recipients.

Changes:

• Models and generates the NewEntryReply operation.
• Exposes it as Entries().NewReply.
• Adds unit and path-conformance coverage.

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Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
spec/hey.smithy	Defines the operation and response.
spec/shape-fingerprint.json	Records the new operation fingerprint.
spec/route-coverage.json	Adds route coverage metadata.
openapi.json	Includes generated OpenAPI definitions.
behavior-model.json	Records operation behavior and retries.
go/pkg/generated/client.gen.go	Generates the typed Go client operation.
go/pkg/hey/entries.go	Adds the public NewReply wrapper.
go/pkg/hey/services_test.go	Tests draft and recipient decoding.
go/pkg/hey/url-routes.json	Registers the generated route mapping.
conformance/runner/go/main.go	Enables conformance execution.
conformance/tests/paths.json	Verifies the request path.

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