[plan] Emit compile-time warning when timeout-minutes > 60 with copilot-requests feature enabled

[github-actions]

Objective

Add a compile-time warning in pkg/workflow/copilot_engine_execution.go that alerts users when they set timeout-minutes > 60 while features: copilot-requests: true is active, because github.token Copilot sessions expire after ~1 hour causing silent mid-run failures.

Context

Ref: #24920 (Problem 2)

When features: copilot-requests: true is used, the agent step's COPILOT_GITHUB_TOKEN is set to ${{ github.token }}. The Copilot API session is bound to the token at creation time and expires after ~1 hour. Any workflow with timeout-minutes > 60 is therefore likely to fail mid-run with authentication errors, with no indication at compile time.

The threat-detection job is not affected (completes in under 1 minute).

Files to Modify

• pkg/workflow/copilot_engine_execution.go — after resolving useCopilotRequests, check workflowData.TimeoutMinutes; if parsed integer value > 60, emit a warning via console.FormatWarningMessage to stderr

Approach

Add logic similar to:

if useCopilotRequests && workflowData.TimeoutMinutes != "" {
    timeoutVal := parseTimeoutMinutesInt(workflowData.TimeoutMinutes)
    if timeoutVal > 60 {
        fmt.Fprintln(os.Stderr, console.FormatWarningMessage(
            "features: copilot-requests: true with timeout-minutes > 60 may cause mid-run " +
            "authentication failures: the github.token Copilot session expires after ~1 hour. " +
            "Set timeout-minutes ≤ 60 or configure COPILOT_GITHUB_TOKEN as a PAT instead."))
    }
}

If a helper parseTimeoutMinutesInt() does not already exist, create it in the same file or a shared utility. It should parse string timeout values (skip GitHub Actions expressions like ${{ inputs.timeout }}).

Acceptance Criteria

• Compiling a workflow with features: copilot-requests: true and timeout-minutes: 90 emits a warning to stderr
• Warning is not emitted when timeout-minutes is absent or ≤ 60
• Warning is not emitted when copilot-requests feature flag is absent/false
• GitHub Actions expression values for timeout-minutes (e.g. ${{ inputs.timeout }}) are gracefully skipped (no crash, no false warning)
• Unit tests cover: warning emitted, not emitted, and expression skip cases
• make agent-finish passes
  Related to Bugfix: GitHub Token S2S TTL and Actions Timeouts #24920

Generated by Plan Command for issue #24920 · ● 142.2K · ◷

• expires on Apr 8, 2026, 4:24 PM UTC

[github-actions]

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I've identified this issue as a good candidate for automated resolution and assigned it to the Copilot coding agent.

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