feat(go-sdk): use generic methods starting Go 1.27

[mnafees]

Description

Start using generic methods starting from Go 1.27 in SDK runnables.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist

Changes have been:

• Tested (unit, integration, or manually with steps specified)
• Linted and formatted

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🤖 AI Disclosure

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Project	Deployment	Actions	Updated (UTC)
hatchet-docs	Ready	Preview	Aug 31, 2026 1:06pm

[greptile-apps]

Greptile Summary

This PR introduces build-tagged generic Go 1.27 task constructors while retaining reflection-based constructors for earlier toolchains, and simplifies internal declaration invocation.

• Adds typed workflow, durable, and standalone task constructors for Go 1.27.
• Moves pre-Go-1.27 reflection-based constructors into fallback files.
• Replaces reflective declaration calls with typed wrappers.
• Simplifies standalone option splitting and failure-handler wrapping.

Confidence Score: 4/5

The PR should not merge until OnFailure either rejects durable context handlers or restores conversion to the accepted context type; the SDK release metadata and comments also need non-blocking cleanup.

OnFailure validation still admits DurableContext handlers, but the changed invocation supplies a plain Context and will panic when such a failure handler runs; the remaining findings concern required release metadata and repository comment conventions.

Files Needing Attention: sdks/go/workflow.go, sdks/go/task_constructors_go127.go

_{Reviews (1): Last reviewed commit: "bad main merge" | Re-trigger Greptile}

[github-actions]

⚠️ Optional test failure: The load-deadlock job failed on this PR (optimistic-scheduling=true). This check is non-mandatory and does not block merging, but may be worth investigating. View logs