Implement edit auto-approve patterns for agent host sessions

Read the chat.tools.edits.autoApprove setting and push it to agent host
sessions via the new editAutoApprovePatterns protocol field. The agent host
server auto-approves file write permission requests matching the patterns,
eliminating the need for user confirmation on safe edits.

Client side:
- Pass editAutoApprovePatterns in createSession for race-free initialization
- Dispatch session/editAutoApprovePatternsChanged on setting changes and reconnection
- Listen for config changes and redispatch

Server side:
- Apply patterns at session creation in AgentService and AgentSideEffects
- Intercept tool_ready write events in registerProgressListener
- Glob-match file paths against patterns, auto-approve or defer to confirmation
- Default patterns match VS Code setting defaults

Protocol mirror synced from microsoft/agent-host-protocol.
Includes unit tests (4), integration tests (3), and client dispatch tests (2).