refactor(hooks): address PR feedback

- Rename getTools/setTools to getActiveTools/setActiveTools
- Add getAllTools to enumerate all configured tools
- Remove text_delta event (use turn_end/agent_end instead)
- Add shortcut conflict detection:
  - Skip shortcuts that conflict with built-in shortcuts (with warning)
  - Log warnings when hooks register same shortcut (last wins)
- Add note about prompt cache invalidation in setActiveTools
- Update plan-mode hook to use agent_end for [DONE:id] parsing

packages/coding-agent/src/core/agent-session.ts

@@ -224,15 +224,6 @@ export class AgentSession {
 
 	/** Internal handler for agent events - shared by subscribe and reconnect */
 	private _handleAgentEvent = async (event: AgentEvent): Promise<void> => {
-		// Emit text_delta events to hooks for streaming text monitoring
-		if (
-			event.type === "message_update" &&
-			event.assistantMessageEvent.type === "text_delta" &&
-			this._hookRunner
-		) {
-			await this._hookRunner.emit({ type: "text_delta", text: event.assistantMessageEvent.delta });
-		}
-
 		// When a user message starts, check if it's from either queue and remove it BEFORE emitting
 		// This ensures the UI sees the updated queue state
 		if (event.type === "message_start" && event.message.role === "user") {
@@ -447,6 +438,13 @@ export class AgentSession {
 		return this.agent.state.tools.map((t) => t.name);
 	}
 
+	/**
+	 * Get all configured tool names (built-in via --tools or default, plus custom tools).
+	 */
+	getAllToolNames(): string[] {
+		return Array.from(this._toolRegistry.keys());
+	}
+
 	/**
 	 * Set active tools by name.
 	 * Only tools in the registry can be enabled. Unknown tool names are ignored.