fix(runtime): detection non bloquante, bornée dans le temps, HTTP pour les profils locaux (#28)

Le first-run wizard restait figé : `CliAgentRuntime::detect` construisait un
runtime tokio courant-thread via `futures_block_on` pour piloter un
`ProcessSpawner` async. Appelé depuis le runtime async de Tauri, ce
`block_on` imbriqué panique ; la commande IPC ne répond alors jamais, la
promesse `detectProfiles` reste pendante et `busy` ne redescend plus.

Ce commit s'attaque à la cause côté backend :

- `AgentRuntime::detect` devient `async fn` (`#[async_trait]`) : le port cesse
  de mentir sur sa nature. Il pilote un spawner async, il est async. Le
  `futures_block_on` disparaît, et avec lui le runtime imbriqué.
- La sonde CLI est bornée par `tokio::time::timeout(DETECTION_TIMEOUT)` :
  un binaire qui ne rend jamais la main dégrade la détection en `Err`, il
  ne gèle plus l'appelant.
- Les profils `StructuredAdapter::OpenAiCompatible` n'ont pas de CLI à
  spawner : les sonder revenait à tester un binaire inexistant. Ils sont
  désormais sondés par un GET HTTP sur l'endpoint `/models` dérivé de
  `chat_http.endpoint`, borné par le même timeout.

`DetectProfiles` séquence les `await` sur les candidats. Les fakes
`AgentRuntime` des crates application/infrastructure/app-tauri suivent la
nouvelle signature.

Tests: cargo test -p domain (241), -p application (81), -p infrastructure
(269), -p app-tauri (63+15) — verts. `rg futures_block_on crates` sans match.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/infrastructure/src/runtime/mod.rs

@@ -17,7 +17,7 @@
 //!   `cwd` (template substitution), and the context-injection plan derived from
 //!   the profile's [`ContextInjection`]. This is the testable core of L5.
 
-use std::sync::Arc;
+use std::{sync::Arc, time::Duration};
 
 use async_trait::async_trait;
 
@@ -25,9 +25,11 @@ use domain::ports::{
     AgentRuntime, ContextInjectionPlan, PreparedContext, ProcessSpawner, RuntimeError, SessionPlan,
     SpawnSpec,
 };
-use domain::profile::{AgentProfile, ContextInjection, SessionStrategy};
+use domain::profile::{AgentProfile, ContextInjection, SessionStrategy, StructuredAdapter};
 use domain::project::ProjectPath;
 
+const DETECTION_TIMEOUT: Duration = Duration::from_millis(800);
+
 /// The single generic AI-runtime adapter. Holds a [`ProcessSpawner`] (used only
 /// by [`detect`](AgentRuntime::detect)); [`prepare_invocation`] is pure.
 #[derive(Clone)]
@@ -179,14 +181,16 @@ impl CliAgentRuntime {
 
 #[async_trait]
 impl AgentRuntime for CliAgentRuntime {
-    fn detect(&self, profile: &AgentProfile) -> Result<bool, RuntimeError> {
+    async fn detect(&self, profile: &AgentProfile) -> Result<bool, RuntimeError> {
+        if profile.structured_adapter == Some(StructuredAdapter::OpenAiCompatible) {
+            return Ok(Self::detect_openai_compatible(profile).await);
+        }
+
         let spec = Self::detection_spec(profile)?;
-        // The port is synchronous but the spawner is async; block on it. The
-        // adapter is invoked off the Tauri async runtime (detection is a
-        // short-lived probe), so a transient runtime here is acceptable and keeps
-        // the `AgentRuntime` port plain-`fn` as the domain declares it.
         let spawner = Arc::clone(&self.spawner);
-        let output = futures_block_on(async move { spawner.run(spec).await })
+        let output = tokio::time::timeout(DETECTION_TIMEOUT, spawner.run(spec))
+            .await
+            .map_err(|_| RuntimeError::Detection("detection timed out".to_owned()))?
             .map_err(|e| RuntimeError::Detection(e.to_string()))?;
         Ok(output.status.code == Some(0))
     }
@@ -225,13 +229,33 @@ impl AgentRuntime for CliAgentRuntime {
     }
 }
 
-/// Minimal block-on helper that drives a future to completion on a fresh
-/// current-thread tokio runtime. Used only by [`CliAgentRuntime::detect`], whose
-/// port signature is synchronous while the [`ProcessSpawner`] it calls is async.
-fn futures_block_on<F: std::future::Future>(fut: F) -> F::Output {
-    tokio::runtime::Builder::new_current_thread()
-        .enable_all()
-        .build()
-        .expect("failed to build a current-thread runtime for detection")
-        .block_on(fut)
+impl CliAgentRuntime {
+    async fn detect_openai_compatible(profile: &AgentProfile) -> bool {
+        let Some(chat) = &profile.chat_http else {
+            return false;
+        };
+        let url = openai_compatible_models_endpoint(&chat.endpoint);
+        let probe = async move {
+            let client = reqwest::Client::builder()
+                .timeout(DETECTION_TIMEOUT)
+                .build()
+                .ok()?;
+            let response = client.get(url).send().await.ok()?;
+            Some(response.status().is_success())
+        };
+        tokio::time::timeout(DETECTION_TIMEOUT, probe)
+            .await
+            .ok()
+            .flatten()
+            .unwrap_or(false)
+    }
+}
+
+fn openai_compatible_models_endpoint(endpoint: &str) -> String {
+    let trimmed = endpoint.trim_end_matches('/');
+    let base = trimmed
+        .strip_suffix("/chat/completions")
+        .unwrap_or(trimmed)
+        .trim_end_matches('/');
+    format!("{base}/models")
 }