feat: centralize default constants and refactor overlay enter handling in TUI

apps/infrastructure/src/subagent/auto/engine.rs

@@ -109,7 +109,7 @@ pub fn spawn_background_review(
         // 3. Resolve LLM credentials
         let base_url = api_base.unwrap_or_else(|| {
             std::env::var("OPENAI_API_BASE")
-                .unwrap_or_else(|_| "https://opencode.ai/zen/v1".to_string())
+                .unwrap_or_else(|_| zesdex_domain::agent::defaults::DEFAULT_API_BASE.to_string())
         });
 
         let client = LlmClient::new(api_key, model, Some(base_url));

apps/infrastructure/src/subagent/event.rs

@@ -1,3 +0,0 @@
-//! Subagent event types — events emitted during subagent execution.
-
-pub use zesdex_domain::subagent::SubagentEvent;

apps/infrastructure/src/subagent/gating.rs

@@ -1,23 +0,0 @@
-//! Subagent gating — decide whether to run review/test/arch agents based
-//! on the current context.
-
-use tracing::instrument;
-
-/// Determine whether an auto-review should be triggered after an edit.
-///
-/// Gating logic:
-/// - Returns `false` if there are no edits (`edit_count == 0`).
-/// - Returns `false` if `consecutive_empty_reviews >= max_skip` (too many
-///   consecutive reviews produced no findings, so skip further reviews).
-/// - Otherwise returns `true`.
-#[instrument]
-pub fn should_review(edit_count: u32, consecutive_empty_reviews: u32, max_skip: u32) -> bool {
-    if edit_count == 0 {
-        return false;
-    }
-    // Skip review if we've had several consecutive empty reviews
-    if consecutive_empty_reviews >= max_skip {
-        return false;
-    }
-    true
-}

apps/infrastructure/src/subagent/mod.rs

@@ -5,9 +5,5 @@ pub mod auto;
 pub mod context;
 pub mod division;
 pub mod engine;
-pub mod event;
-pub mod gating;
 pub mod provider;
 pub mod spawn;
-pub mod tools;
-pub mod workspace;

apps/infrastructure/src/subagent/provider.rs

@@ -67,7 +67,7 @@ impl SubagentProvider {
 ///
 /// Flow: reads `settings.provider` and `settings.model` → if model is empty,
 /// falls back to the provider config's `default_model` → if that is also
-/// empty, uses `"deepseek-v4-flash-free"` as the ultimate default.
+/// empty, uses the domain default model constant.
 #[instrument]
 pub fn resolve_subagent_provider(
     settings: &zesdex_domain::cms::Settings,
@@ -82,7 +82,7 @@ pub fn resolve_subagent_provider(
             .providers
             .get(&provider)
             .and_then(|p| p.default_model.clone())
-            .unwrap_or_else(|| "deepseek-v4-flash-free".to_string())
+            .unwrap_or_else(|| zesdex_domain::agent::defaults::DEFAULT_MODEL.to_string())
     } else {
         model
     };

apps/infrastructure/src/subagent/tools.rs

@@ -1,19 +0,0 @@
-//! Subagent tool helpers — wrap tool execution for subagent use.
-
-use anyhow::Result;
-use tracing::instrument;
-
-use crate::tools::{Tool, ToolCtx};
-
-/// Execute a single tool call within a subagent context.
-///
-/// Delegates directly to the tool's `run` method with the given context and
-/// JSON arguments.
-#[instrument(skip(tool, ctx, args))]
-pub fn execute_tool_call(
-    tool: &dyn Tool,
-    ctx: &ToolCtx,
-    args: &serde_json::Value,
-) -> Result<String> {
-    tool.run(ctx, args)
-}

apps/infrastructure/src/subagent/workspace.rs

@@ -1,16 +0,0 @@
-//! Subagent workspace management — create isolated workspaces for subagents.
-
-use std::path::{Path, PathBuf};
-
-use tracing::instrument;
-
-/// Create an isolated workspace directory for a subagent.
-///
-/// Creates `{base_dir}/subagent-workspaces/{agent_id}` and all parent
-/// directories if they do not already exist.
-#[instrument]
-pub fn create_subagent_workspace(base_dir: &Path, agent_id: &str) -> anyhow::Result<PathBuf> {
-    let ws = base_dir.join("subagent-workspaces").join(agent_id);
-    std::fs::create_dir_all(&ws)?;
-    Ok(ws)
-}