Pin Agentic Triage to a supported Copilot model - #11826

This PR updates the Agentic Triage workflow configuration to pin the Copilot engine/model so repository/org defaults can’t select an unsupported model, and regenerates the compiled lock workflow accordingly.

Changes:

• Switch .github/workflows/issue-triage.md from engine: copilot to an explicit engine.id + engine.model configuration.
• Regenerate .github/workflows/issue-triage.lock.yml to hard-code the selected model in the compiled workflow (replacing prior ${{ vars... }} fallback logic).

Suppressed comments (4)

.github/workflows/issue-triage.lock.yml:127

• This is pinned to gpt-5, but the failure issue’s error output lists models available to the agentic-workflows integrator and it does not include gpt-5 (it does include claude-sonnet-5). After changing the source workflow to a supported model, regenerate the lock file so all model fields match.

          GH_AW_INFO_ENGINE_ID: "copilot"
          GH_AW_INFO_ENGINE_NAME: "GitHub Copilot CLI"
          GH_AW_INFO_MODEL: "gpt-5"
          GH_AW_INFO_VERSION: "1.0.63"

.github/workflows/issue-triage.lock.yml:847

• COPILOT_MODEL is pinned to gpt-5, but the failure issue’s error output indicates gpt-5 is not available for the agentic-workflows integrator. This should be updated to a supported model (e.g. claude-sonnet-5) by regenerating the lock file from the source workflow.

          COPILOT_AGENT_RUNNER_TYPE: STANDALONE
          COPILOT_DUMMY_BYOK: dummy-byok-key-for-offline-mode
          COPILOT_GITHUB_TOKEN: ${{ github.token }}
          COPILOT_MODEL: gpt-5
          GH_AW_MAX_AI_CREDITS: ${{ vars.GH_AW_DEFAULT_MAX_AI_CREDITS || '1000' }}

.github/workflows/issue-triage.lock.yml:1543

• GH_AW_ENGINE_MODEL is hard-coded to gpt-5, but the failure issue’s error output suggests gpt-5 is not available for the agentic-workflows integrator (while claude-sonnet-5 is). Regenerate the lock file after updating the pinned model so the exported summary matches the actual supported model.

      GH_AW_EFFECTIVE_TOKENS: ${{ needs.agent.outputs.effective_tokens }}
      GH_AW_ENGINE_ID: "copilot"
      GH_AW_ENGINE_MODEL: "gpt-5"
      GH_AW_ENGINE_VERSION: "1.0.63"

.github/workflows/issue-triage.lock.yml:1447

• The detection phase also pins COPILOT_MODEL to gpt-5, which (per the failure issue’s model availability list) is not available for the agentic-workflows integrator. Regenerate the lock file after switching to a supported model to avoid detection failures.

          COPILOT_AGENT_RUNNER_TYPE: STANDALONE
          COPILOT_DUMMY_BYOK: dummy-byok-key-for-offline-mode
          COPILOT_GITHUB_TOKEN: ${{ github.token }}
          COPILOT_MODEL: gpt-5
          GH_AW_MAX_AI_CREDITS: ${{ vars.GH_AW_DEFAULT_DETECTION_MAX_AI_CREDITS || '400' }}

• Files reviewed: 2/2 changed files
• Comments generated: 2
• Review effort level: Lite

• Files reviewed: 2/2 changed files
• Comments generated: 0 new
• Review effort level: Lite