fix: fix some ui displays and features miss implemented

crates/domain/src/agent.rs

@@ -4,6 +4,7 @@ use serde::{Deserialize, Serialize};
 
 use crate::error::DomainError;
 use crate::ids::{AgentId, ProfileId, TemplateId};
+use crate::skill::SkillRef;
 use crate::template::TemplateVersion;
 
 /// Origin of an agent: created from scratch, or derived from a template.
@@ -65,6 +66,10 @@ pub struct Agent {
     pub origin: AgentOrigin,
     /// Whether the agent tracks its template (only valid for template origins).
     pub synchronized: bool,
+    /// Skills assigned to this agent, injected into its convention file at
+    /// activation (ARCHITECTURE §14.2). Empty by default.
+    #[serde(default)]
+    pub skills: Vec<SkillRef>,
 }
 
 impl Agent {
@@ -98,8 +103,37 @@ impl Agent {
             profile_id,
             origin,
             synchronized,
+            skills: Vec::new(),
         })
     }
+
+    /// Returns a copy of this agent carrying the given assigned skills,
+    /// deduplicated by `skill_id` (keeping first occurrence).
+    #[must_use]
+    pub fn with_skills(mut self, skills: Vec<SkillRef>) -> Self {
+        self.skills = Vec::new();
+        for skill in skills {
+            self.assign_skill(skill);
+        }
+        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 {
+        if self.skills.iter().any(|s| s.skill_id == skill.skill_id) {
+            return false;
+        }
+        self.skills.push(skill);
+        true
+    }
+
+    /// Removes a skill assignment by id. Returns `true` if a skill was removed.
+    pub fn unassign_skill(&mut self, skill_id: crate::ids::SkillId) -> bool {
+        let before = self.skills.len();
+        self.skills.retain(|s| s.skill_id != skill_id);
+        self.skills.len() != before
+    }
 }
 
 /// One entry in the project agent manifest (`.ideai/agents.json`).
@@ -135,6 +169,10 @@ pub struct ManifestEntry {
     /// Template version recorded at the last sync.
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub synced_template_version: Option<TemplateVersion>,
+    /// Skills assigned to this agent (ARCHITECTURE §14.2). Defaults to empty for
+    /// backward-compatible deserialisation of pre-L12 manifests.
+    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    pub skills: Vec<SkillRef>,
 }
 
 impl ManifestEntry {
@@ -172,6 +210,7 @@ impl ManifestEntry {
             template_id,
             synchronized,
             synced_template_version,
+            skills: Vec::new(),
         })
     }
 
@@ -196,6 +235,7 @@ impl ManifestEntry {
             template_id,
             synchronized: agent.synchronized,
             synced_template_version,
+            skills: agent.skills.clone(),
         }
     }
 
@@ -213,14 +253,15 @@ impl ManifestEntry {
             },
             _ => AgentOrigin::Scratch,
         };
-        Agent::new(
+        Ok(Agent::new(
             self.agent_id,
             self.name.clone(),
             self.md_path.clone(),
             self.profile_id,
             origin,
             self.synchronized,
-        )
+        )?
+        .with_skills(self.skills.clone()))
     }
 }