[docs] Update documentation for features from 2026-03-19

[github-actions]

Documentation Updates - 2026-03-19

This PR updates the documentation based on features merged in the last 24 hours.

Features Documented

• CopilotService gRPC API (from #7172) — New gRPC service enabling extensions to interact with GitHub Copilot agent capabilities programmatically.
• azure.ai.agents v0.1.16-preview (from #7141, #7175, #7181) — New file operations commands and breaking change to show/monitor commands.

Changes Made

• Updated cli/azd/docs/extensions/extension-framework.md:
  • Added Copilot Service to both Table of Contents sections (top-level and gRPC Services section)
  • Added full Copilot Service documentation section covering all 7 RPCs: Initialize, ListSessions, SendMessage, GetUsageMetrics, GetFileChanges, GetMessages, and StopSession
  • Includes message schemas, field descriptions, Go usage example, and use cases
• Updated cli/azd/extensions/azure.ai.agents/CHANGELOG.md:
  • Added 0.1.16-preview release entry with new features and breaking changes

Merged PRs Referenced

• #7172 — feat: add CopilotService gRPC service for extension framework
• #7141 — [Agent Extension] Add file operations for hosted agent sessions
• #7175 — fix: improve input validation, error handling, and path safety
• #7181 — [Agents Extension] Update show and monitor commands to not require parameters
• #7190 — Prepare azure.ai.agents 0.1.16-preview patch release

Notes

• PRs feat: rename job create to submit and add resolver layer for compute,… Azure/azure-dev#7205/feat: enhance job list with pagination, filters, and systemData support Azure/azure-dev#7203 (job create→submit rename and job list enhancements) target the foundry-training-dev branch, not main, and relate to an unreleased extension without existing user docs — excluded from this update.
• PR Implement azd update to use installation script for Windows Azure/azure-dev#7166 (Windows MSI update improvements) is an internal reliability fix — no user-facing documentation change required.
• PR Rebrand agent UX to GitHub Copilot and improve prompt quality Azure/azure-dev#7194 (GitHub Copilot rebranding) affects UX text only, no documentation changes required.

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