Summary

Add shared infrastructure required by all ADO Backlog Manager workflows:
three-tier autonomy model, content sanitization guards, content format detection
(Markdown for ADO Services, HTML for ADO Server), and interaction templates.

Part of #774.

Changes

New Files

• .github/instructions/ado/ado-interaction-templates.instructions.md
  • 6 Category A description templates in Markdown (User Story, Acceptance Criteria, Bug, Task, Epic, Feature)
  • 6 Category A-HTML description templates for Azure DevOps Server
  • 7 Category B comment templates (status update, state transition, duplicate closure,
    blocking, request info, sprint rollover, PR linked)

Modified Files

• .github/instructions/ado/ado-wit-planning.instructions.md
  • Added Three-Tier Autonomy Model section (Full/Partial/Manual modes with gate matrix)
  • Added Content Sanitization Guards section (local-only path guard, planning reference ID guard)
  • Added Content Format Detection section (4-rule detection protocol, format conversion table)
• .github/instructions/ado/ado-update-wit-items.instructions.md
  • Dynamic format parameter in MCP tool call examples (Markdown + HTML variants)
• collections/ado.collection.yml (interaction-templates entry)

Acceptance Criteria

• ado-interaction-templates.instructions.md created with 6 Markdown + 6 HTML description templates + 7 comment templates
• Three-Tier Autonomy Model added to ado-wit-planning.instructions.md
• Content Format Detection section added to ado-wit-planning.instructions.md
• Content Sanitization Guards added to ado-wit-planning.instructions.md
• Dynamic format parameter in ado-update-wit-items.instructions.md
• Collection manifest updated
• Markdown linting passes