feat(cross-project): découverte et contact inter-projets — tools MCP idea_project_{list,read_context,list_agents,ask_agent,cancel_agent}, permission contactable par agent + default_contactable persistée dans les templates, routage orchestrator par projectId+agentId — #260 (tests ciblés verts, QA en attente)

crates/domain/src/agent.rs

@@ -75,6 +75,9 @@ pub struct Agent {
     /// `model_reasoning_effort` at launch.
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub effort: Option<EffortSelection>,
+    /// Whether this agent may be discovered/contacted from another project.
+    #[serde(default, skip_serializing_if = "std::ops::Not::not")]
+    pub contactable: bool,
 }
 
 impl Agent {
@@ -110,6 +113,7 @@ impl Agent {
             synchronized,
             skills: Vec::new(),
             effort: None,
+            contactable: false,
         })
     }
 
@@ -141,6 +145,13 @@ impl Agent {
         self
     }
 
+    /// Returns a copy with the cross-project contact permission changed.
+    #[must_use]
+    pub const fn with_contactable(mut self, contactable: bool) -> Self {
+        self.contactable = contactable;
+        self
+    }
+
     /// Assigns a skill to this agent. Idempotent: re-assigning the same
     /// `skill_id` is a no-op (returns `false`); a new assignment returns `true`.
     pub fn assign_skill(&mut self, skill: SkillRef) -> bool {
@@ -199,6 +210,9 @@ pub struct ManifestEntry {
     /// Per-agent effort selection. Missing in older manifests means no override.
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub effort: Option<EffortSelection>,
+    /// Whether this agent may be discovered/contacted from another project.
+    #[serde(default, skip_serializing_if = "std::ops::Not::not")]
+    pub contactable: bool,
 }
 
 impl ManifestEntry {
@@ -238,6 +252,7 @@ impl ManifestEntry {
             synced_template_version,
             skills: Vec::new(),
             effort: None,
+            contactable: false,
         })
     }
 
@@ -264,6 +279,7 @@ impl ManifestEntry {
             synced_template_version,
             skills: agent.skills.clone(),
             effort: agent.effort.clone(),
+            contactable: agent.contactable,
         }
     }
 
@@ -290,7 +306,8 @@ impl ManifestEntry {
             self.synchronized,
         )?
         .with_skills(self.skills.clone())
-        .with_effort(self.effort.clone()))
+        .with_effort(self.effort.clone())
+        .with_contactable(self.contactable))
     }
 }