[Feature]: Add structured PR review workflow for Claude Code

[theisij]

Feature Description

Add a structured PR review workflow to Claude Code that automates Copilot triage, convention checks, holistic review, and merge operations through a set of coordinated skills and agents.

5 new skills:

• /review-workflow <PR#> — Full end-to-end orchestrator (setup → Copilot triage → automated review → self-check → interview reviewer → decision)
• /triage-copilot <PR#> — Fetch and classify Copilot review suggestions (incorporate / ignore / discuss)
• /review-pr <PR#> — Run code-critic + doc-sync + pr-reviewer agents in parallel
• /draft-pr-comment <PR#> — Draft and post structured change-request comments
• /approve-pr <PR#> — Pre-flight safety checks, approve, squash-merge, delete branch

2 new agents:

• copilot-triage — Classifies each Copilot suggestion against project conventions
• pr-reviewer — Holistic review covering correctness, methodology, architecture, tests, performance, completeness, and data impact

Updates to 3 existing agents (code-critic, doc-sync, test-scaffolder):

• Added tool-usage guidance (no command chaining)
• Fixed dependency group references (--group lint, --group test)

Settings update:

• Ruff format hook updated to use --group lint

Use Case / Motivation

The project is receiving a growing volume of PRs. This workflow provides a structured, repeatable process for reviewing them — automating convention checks, Copilot triage, and holistic analysis while keeping the reviewer engaged through follow-up questions and a decision gate before any action is taken.

Proposed Implementation

Implementation is complete. All files live under .claude/agents/ and .claude/skills/. No changes to code/ or tests/.

Alternatives Considered

Manual review checklists — rejected because a structured workflow ensures consistent coverage across all review dimensions without relying on memory.