[WIP] Fix agent failure issue creation by removing pre-agent denomination

[Copilot]

• Remove isPreAgentFailure detection and failureStage variable from handle_agent_failure.cjs
• Simplify issue title to always use [aw] ${workflowName} failed without stage suffix
• Update changeset description
• Run fmt/lint validation (passed)

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[Copilot]

Pull request overview

This PR removes the pre-agent failure detection logic from the handle_agent_failure.cjs script, simplifying the failure issue title to always use [aw] ${workflowName} failed without the (pre-agent) stage suffix.

Changes:

• Removed isPreAgentFailure detection, failureStage variable, and associated comments from handle_agent_failure.cjs
• Updated the changeset description to remove mention of labeling pre-agent failures in issue titles

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
actions/setup/js/handle_agent_failure.cjs	Removed pre-agent failure detection logic and simplified issue title construction
.changeset/patch-conditional-agent-output.md	Updated changeset description to remove reference to pre-agent failure labeling

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[Copilot]

The changeset description no longer accurately describes what this PR does. It says "Make the agent-output download step conditional so GH_AW_AGENT_OUTPUT is only set when the artifact succeeds," but the actual change here is removing the pre-agent failure detection and simplifying the issue title. Consider updating the changeset description to match the actual changes, e.g., "Remove pre-agent failure detection from issue title generation to simplify failure tracking."