Pin Matt Pocock reviewer to supported Copilot model

[Copilot]

The Matt Pocock Skills Reviewer workflow was failing in the agent step due to model-level request misconfiguration (400 on anthropic-beta header). This change makes model selection explicit and consistent so the review job no longer depends on fallback resolution.

• Model configuration

  • Set an explicit workflow model in mattpocock-skills-reviewer.md:
    • engine.id: copilot
    • engine.model: claude-sonnet-4.6

• Compiled workflow alignment

  • Regenerated mattpocock-skills-reviewer.lock.yml so all runtime surfaces use the same pinned model (activation metadata, COPILOT_MODEL in agent/detection, and conclusion metadata).

• Behavioral effect

  • Removes reliance on ${{ vars.GH_AW_MODEL_*_COPILOT || 'claude-sonnet-4.5' }} fallback paths for this workflow.
  • Ensures deterministic model routing for the reviewer pipeline.

engine:
  id: copilot
  model: claude-sonnet-4.6
  max-continuations: 6

[Copilot]

Pull request overview

Pins the Matt Pocock Skills Reviewer workflow to an explicit GitHub Copilot model to avoid relying on variable-based fallback model resolution and to prevent agent-step failures caused by misconfigured model-level requests.

Changes:

• Added an explicit engine.model: claude-sonnet-4.6 to the source workflow markdown.
• Regenerated the compiled lock workflow so the pinned model is reflected across activation metadata and both agent/detection COPILOT_MODEL envs.

Show a summary per file

File	Description
.github/workflows/mattpocock-skills-reviewer.md	Adds explicit engine.model to make model selection deterministic for this workflow.
.github/workflows/mattpocock-skills-reviewer.lock.yml	Updates generated workflow artifact to consistently use the pinned model across runtime surfaces and metadata.

Copilot's findings

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• Files reviewed: 2/2 changed files
• Comments generated: 0