[DOCS] Create instructions/pr-templates.instructions.md

[ashleyshaw]

Create portable, detailed instruction file for PR template usage across all repositories.

Details

• Follow the pattern in .github/instructions/instructions.instructions.md
• Include frontmatter
• Sections: Overview, General Rules, Detailed Guidance, Examples, Validation, References
• No .github assumptions (reusable outside this repo)
• Explain each template type and when to use it
• Link to BRANCHING_STRATEGY.md for branch naming context

Template Coverage

• pr_bug.md: When to use, what's required, what's optional
• pr_feature.md: Feature-specific sections, acceptance criteria
• pr_chore.md: Maintenance and housekeeping work
• pr_ci.md: CI/CD and workflow changes
• pr_docs.md: Documentation-only changes
• pr_hotfix.md: Critical production fixes
• pr_refactor.md: Code restructuring
• pr_release.md: Release preparation
• pr_deps.md: Dependency updates

Acceptance Criteria

• File follows instruction template pattern (frontmatter, role, overview, rules, guidance, examples, validation, refs)
• Covers all 9+ PR template types
• Includes examples of correct and incorrect usage
• References BRANCHING_STRATEGY.md

Metadata

Issue Type: Task
Priority: High
Phase: 2 - Documentation & Guidance
Effort: 1.5h
Depends on: #2, #4

Project: Template Enforcement & Governance

[linear-code]

LS-858

[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

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