Bump the SDK to 0.15.0

[robzolkos]

Release prep for v0.15.0, carrying the Journal feed and search API from #110.

Change

• bump the Go SDK from 0.14.0 to 0.15.0
• keep the API contract date unchanged

Validation

• GOWORK=off make check
• 156 conformance checks passed
• production accepted a read-only JournalService.ListPage call from the merged SDK implementation

Delivery

After this lands on main, run make release VERSION=0.15.0 to create and push both v0.15.0 and go/v0.15.0.

Related work:

• List journal entries #110
• https://github.com/basecamp/haystack/pull/8655
• https://app.basecamp.com/2914079/buckets/48521764/card_tables/cards/10228996495

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Summary by cubic

Bumps the HEY Go SDK from 0.14.0 to 0.15.0 to release the Journal feed and search API from #110. The API contract date stays the same, so existing endpoints behave the same.

• Only change in code: update the Version constant; APIVersion remains "2026-08-21".
• No migration required; new Journal feed and search APIs are available to consumers.
• Validation: 156 conformance checks passed; production accepted a read-only JournalService.ListPage call.
• Rollout: after merge to main, run make release VERSION=0.15.0 to publish v0.15.0 and go/v0.15.0.

^{Written for commit 6981f7d. Summary will update on new commits.}

[Copilot]

Pull request overview

Prepares the Go SDK v0.15.0 release while retaining the existing API contract date.

Changes:

• Updates the SDK version from 0.14.0 to 0.15.0.
• Leaves APIVersion unchanged.

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