Prevent Linter Miner runs from completing without a terminal safe output

[Copilot]

Linter Miner run 25949820523 succeeded at the agent job level but produced no safe outputs, causing downstream handling to flag the run. The workflow prompt allowed execution paths where sub-agent activity could outlive the parent turn and exit without a terminal safe-output call.

• Prompt flow hardening

  • Changed Step 2 in .github/workflows/linter-miner.md from parallel sub-agent mining to sequential execution (discussion-miner then code-pattern-scanner) to avoid unfinished child work at parent completion time.

• Terminal safe-output contract

  • Added explicit completion rules:
    • do not finish while spawned sub-agents are still running,
    • if any sub-agent fails/stalls/incompletes, emit noop with explanation,
    • final turn must emit exactly one safe output: create_pull_request or noop.

• Behavioral intent

  • Tightens the workflow’s “no silent exit” behavior so no-op outcomes are explicitly represented in safe outputs instead of ending with empty output artifacts.

- Do not finish while any spawned sub-agent is still running.
- If any sub-agent step fails, stalls, or does not complete, call `noop` with a clear explanation instead of ending without output.
- Final turn requirement: call exactly one safe output (`create_pull_request` or `noop`) as your last action before finishing.

[Copilot]

Pull request overview

Hardens the linter-miner workflow prompt to prevent runs from completing without a terminal safe output by serializing sub-agent execution and adding explicit completion rules.

Changes:

• Switches Step 2 sub-agent mining from parallel to sequential to avoid orphaned child work at parent completion.
• Adds explicit completion rules requiring exactly one terminal safe output (create_pull_request or noop).

Show a summary per file

File	Description
.github/workflows/linter-miner.md	Sequential sub-agent execution and tightened terminal safe-output contract

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