Optimize mattpocock-skills-reviewer by offloading PR triage to an inline small-model sub-agent

[Copilot]

This workflow was consuming ~1.97M tokens/run, with a deterministic triage phase embedded in the main prompt. This change extracts that phase into an inline pr-triage sub-agent so the main reviewer can start from structured triage output instead of re-deriving context from the full diff.

• Prompt flow changes

  • Replaced Step 3’s static change-type/skill table with explicit pr-triage invocation + JSON consumption.
  • Updated Step 4 to prioritize files returned by triage (high_impact_files) when applying skills.

• New inline sub-agent (pr-triage)

  • Added ## agent: \pr-triage`at the end of the workflow usingclaude-haiku-4.5`.
  • Defines deterministic triage responsibilities:
    • classify change_type (fixed enum),
    • select 1–2 recommended_skills,
    • rank high_impact_files,
    • emit concise key_signals.
  • Includes strict JSON output contract to keep downstream behavior predictable.

• Contract clarity improvements

  • Step 3 now explicitly instructs the parent reviewer to invoke pr-triage and use its returned fields.
  • Triage file ranking guidance is risk-based (not hard-capped), so output can scale with PR shape.

{
  "change_type": "bug_fix",
  "recommended_skills": ["/diagnose", "/tdd"],
  "high_impact_files": [
    { "path": "pkg/example/file.go", "reason": "Touches core behavior used by multiple call sites." }
  ],
  "key_signals": [
    "Adds regression tests for previous nil-pointer crash.",
    "Modifies error handling path in request processing."
  ]
}

[Copilot]

Pull request overview

This PR refactors the “Matt Pocock skills reviewer” workflow prompt to offload deterministic PR triage (change-type classification + skill selection + file prioritization) into a dedicated inline sub-agent, so the main reviewer starts from structured triage output instead of re-deriving it from the full diff.

Changes:

• Replaced the Step 3 static change-type/skill mapping table with instructions to invoke a new pr-triage inline agent and consume its JSON output.
• Updated Step 4 guidance to prioritize review focus based on pr-triage.high_impact_files.
• Regenerated the compiled .lock.yml workflow (introducing updated gh-aw compilation metadata and runtime pins).

Show a summary per file

File	Description
.github/workflows/mattpocock-skills-reviewer.md	Moves change-type/skill selection into a new inline pr-triage agent with a strict JSON contract; updates reviewer instructions to consume that output.
.github/workflows/mattpocock-skills-reviewer.lock.yml	Regenerated compiled workflow with updated compiler metadata and updated pinned actions/images/tooling configuration.

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