refactor(host): move pre_validator to op-web-daemon (Phase 2 leaf)

Pre-validation adapter (PlannedFix -> EditorCommand via op-design-lint) for the
design pipeline. Promoted to pub; 2 consumers repointed. Completes Task 2.1
(all 7 host-free leaves moved). No dep/lock change.

crates/op-host-desktop/src/design_session.rs

@@ -58,7 +58,7 @@ use op_orchestrator::{
 };
 
 use crate::chat_runtime::shared_runtime;
-use crate::pre_validator::LintPreValidator;
+use op_web_daemon::pre_validator::LintPreValidator;
 
 /// Spawn a worker that runs `Orchestrator::run` against a `RemoteDocSink`.
 pub fn start<L: LlmClient + Send + 'static>(

crates/op-host-desktop/src/main.rs

@@ -54,7 +54,6 @@ mod menu_action;
 mod model_discovery;
 mod persistence;
 mod persistence_image;
-mod pre_validator;
 mod provider_probe;
 mod provider_probe_host;
 mod provider_probe_models;

crates/op-host-desktop/src/web_chat_standard.rs

@@ -22,7 +22,7 @@ use serde_json::Value;
 
 use crate::ai_proxy::AiStreamRequest;
 use op_web_daemon::chat_provider_llm::ChatProviderLlmClient;
-use crate::pre_validator::LintPreValidator;
+use op_web_daemon::pre_validator::LintPreValidator;
 use crate::web_canvas_server::{SseHub, WebCanvasState};
 
 const STANDARD_MODIFY_STEP: &str =

crates/op-web-daemon/src/lib.rs

@@ -19,4 +19,5 @@ pub mod chat_provider_llm;
 pub mod chat_spawn;
 pub mod chat_subprocess_quirks;
 pub mod chat_system_prompt;
+pub mod pre_validator;
 pub mod web_static;