docs(agents): add agent skills configuration and conventions

[kaseywright]

Document issue tracker (GitHub via gh CLI), triage label vocabulary, and domain docs consumption pattern for engineering skills. Covers single/multi-context CONTEXT.md structure, ADR reading, wayfinding operations, and PR-as-request-surface flag.

Summary by CodeRabbit

• Documentation
  • Added guidance for engineering agents on issue tracking, triage labels, and domain documentation.
  • Documented issue-management workflows, including ticket creation, retrieval, labeling, commenting, and resolution.
  • Defined canonical triage labels and their meanings.
  • Added guidance for consulting context files, architecture decisions, repository layouts, terminology, and documentation conflicts.

[coderabbitai]

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⚙️ Run configuration

Configuration used: defaults

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Run ID: 6bcd50a9-622b-4a04-88f9-19db4dfbde07

📥 Commits

Reviewing files that changed from the base of the PR and between 7037b7c and 0360fa3.

📒 Files selected for processing (4)

• AGENTS.md
• docs/agents/domain.md
• docs/agents/issue-tracker.md
• docs/agents/triage-labels.md

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< Solving problems you didn't know you were about to have. >
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✨ Finishing Touches

🧪 Generate unit tests (beta)

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