Document actor deactivation in actor_update description

Actors are deactivated (not deleted) to preserve audit trail integrity.
Use `actor update <name> --active false` to revoke access. The richer
description surfaces this in the MCP tool guidance.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bricef

internal/model/operations.go

@@ -237,6 +237,7 @@ func Operations() []Operation {
 		Create("/actors", "Create an actor").Name("actor_create").Role(RoleAdmin).
 			Input(CreateActorParams{}).Output(Actor{}).Build(),
 		Update("/actors/{name}", "Update an actor").Name("actor_update").Role(RoleAdmin).
+			Desc("Update actor details. Set --active false to deactivate (revokes API key access, preserves audit history). Set --active true to reactivate.").
 			Input(UpdateActorParams{}).Output(Actor{}).Build(),
 
 		// Boards