Replace client-side permission mode hack with proper ACP session modes:
- Add typed Client interface implementation to ACPClient
- Import proper types from ACP SDK (SessionNotification, RequestPermissionRequest, etc.)
- Fix critical sessionUpdate bug where params.update was undefined
- Replace PermissionMode with SessionMode from ACP spec
- Add getCurrentMode(), getAvailableModes(), setSessionMode() to AgentManager
- Update MCP tools: replace set_agent_permission_mode with set_agent_mode
- Add session_state message type to send live agents/commands to client
- Update UI to display session mode badges (ask/code/architect)
- Remove all permissionsMode references from tests
Agents now have ONE mode (session mode) that controls their behavior,
system prompts, and tool availability - not separate permission/session modes.
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Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>
