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 using domain documentation, context files, and architecture decision records.
  • Documented issue-tracker workflows, including issue and pull request handling, triage, dependencies, and ticket resolution.
  • Added canonical mappings for issue-triage roles and labels.
  • Added an overview of available agent skills and related documentation locations.

[coderabbitai]

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 713fa924-fe8c-4475-b130-fd2ca4c7c1d9

📥 Commits

Reviewing files that changed from the base of the PR and between db7fdfd and 519ac13.

📒 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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🧪 Generate unit tests (beta)

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