[DOCS] Update AGENT.md with canonical template rules

[ashleyshaw]

Add comprehensive "Template & Issue Type Governance" section to AGENT.md as single source of truth.

Details

• Add new section after "Git & Branching Strategy"
• Define PR template selection rules (branch name → template mapping)
• Define issue template selection rules (problem type → template mapping)
• Explain enforcement mechanisms (workflow, agent, CI)
• Link to portable instruction files
• Make clear this is canonical for all AI models

Content

1. Overview: Why templates matter for automation
2. PR Template Rules: Table mapping branch prefixes to templates
3. Issue Template Rules: Table mapping issue characteristics to templates
4. Template Anatomy: Common sections, required fields, optional fields
5. Enforcement: How violations are detected and corrected
6. References: Links to instructions, templates, CI workflow

Acceptance Criteria

• AGENT.md section is comprehensive and authoritative
• All branch types covered
• All issue types covered
• Enforcement approach is clear
• References point to real files

Metadata

Issue Type: Task
Priority: High
Phase: 2 - Documentation & Guidance
Effort: 2h
Depends on: #2, #4, #5, #6

Project: Template Enforcement & Governance

[linear-code]

LS-860

[ashleyshaw]

Status Update: Backlog published to develop ✅

Template enforcement project backlog is now live. This issue is Phase 2 (Documentation) and depends on Phase 1 completion (#709–#711).

Complete backlog: .github/projects/active/template-enforcement-governance/ISSUES.md
Action plan: .github/projects/active/template-enforcement-governance/ACTIONS.md

Once Phase 2 is complete, Phase 3 issues (#717–#720) can begin.

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