Campaign orchestrator: Add explicit instructions for discovering worker-created issues

[Copilot]

Campaign orchestrator run #20330838254 failed to discover issue #6820 created by worker run #20330678188. The agent used safeoutputs-noop instead of querying GitHub API because instructions lacked technical specificity.

Changes

• Enhanced orchestrator template (pkg/campaign/prompts/orchestrator_instructions.md)

  • Replaced vague "Query GitHub Actions API" with explicit MCP tool names: github-list_workflow_runs, github-list_workflow_run_artifacts
  • Added step-by-step artifact download and parsing procedure
  • Specified environment variable format: GH_AW_OUTPUT_CREATE_ISSUE_ISSUE_URL
  • Added GitHub Issues search as fallback mechanism
  • Named exact safe-output action for project board updates: update-project

• Regenerated campaign workflows

  • go-file-size-reduction-project64.campaign.g.{md,lock.yml}
  • go-file-size-reduction.campaign.g.{md,lock.yml}

Before/After

Before:

1. Query GitHub Actions API for recent workflow runs using the worker's tracker-id
2. Examine workflow run outputs and artifacts to discover issues created by the worker

After:

1. **Query GitHub Actions API for recent workflow runs** using the GitHub MCP server:
   - Use `github-list_workflow_runs` with the worker's workflow file (e.g., `daily-file-diet.lock.yml`)
   - Filter for recent completed runs (last 24-48 hours)
   
2. **Extract issue URLs from workflow run artifacts**:
   - Use `github-list_workflow_run_artifacts` to list artifacts
   - Download the `agent-output` artifact
   - Look for outputs like: `GH_AW_OUTPUT_CREATE_ISSUE_ISSUE_URL`

The fix transforms abstract guidance into executable technical steps, enabling campaigns to properly discover and track worker-created issues.

Original prompt

Analyze campaign run: https://github.com/githubnext/gh-aw/actions/runs/20330838254
and understsand why this run by the worker (daily file diet) #6820 was not picked up by the campaign and reported on the campaign's project board.

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