Command center: edit brain sections inline from the cards

Add PATCH /api/claws/{id}/brain (edit_brain): writes any of system_prompt / agent_md
/ persona / skills_md into the claw's .brain (best-effort) + persists system_prompt
to Postgres (authoritative) + commits a ClawSync revision.

Frontend: a reusable EditableSection (pencil → textarea → Save/Cancel → PATCH →
re-fetch brain). The SYSTEM PROMPT, HOW I OPERATE (AGENTS.md), and PERSONALITY cards
in the command center are now editable inline; saving writes back to the mapped
brain section. AGENTS.md card now always shows (so it can be authored when empty).

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

crates/cm-api/src/routes/claws.rs

@@ -218,6 +218,53 @@ fn load_brain(agent: &Agent, skills: &[(String, String)]) -> ClawBrainResponse {
     }
 }
 
+/// Edit one or more brain sections from the command-center cards.
+#[derive(Deserialize)]
+pub struct BrainEdit {
+    pub system_prompt: Option<String>,
+    pub agent_md: Option<String>,
+    pub persona: Option<String>,
+    pub skills_md: Option<String>,
+}
+
+/// `PATCH /api/claws/{id}/brain` — edit individual `.brain` sections inline from
+/// the dashboard cards. Each present field is written to the claw's brain;
+/// `system_prompt` is also persisted to Postgres (authoritative). Commits a
+/// ClawSync revision so every edit is reversible.
+pub async fn edit_brain(
+    State(state): State<AppState>,
+    Authed(user): Authed,
+    Path(id): Path<AgentId>,
+    Json(req): Json<BrainEdit>,
+) -> Result<Json<Value>, ApiError> {
+    let agent = workspace_agent(&state, &user, id).await?;
+    // system_prompt stays authoritative in Postgres.
+    if let Some(sp) = req.system_prompt.as_ref() {
+        let _ = cm_db::repo::agents::update_profile(
+            &state.pool, agent.id, None, None, Some(sp.trim()), None, None, None,
+        )
+        .await;
+    }
+    // Mirror every edited section into the `.brain` (best-effort) + snapshot.
+    let path = brain_dir().join(format!("claw_{}.h5", agent.id));
+    if let Ok(mut brain) = cm_brain::ClawBrain::open_or_create(&path, &agent.id.to_string()) {
+        if let Some(sp) = req.system_prompt.as_ref() {
+            let _ = brain.set_system_prompt(sp);
+        }
+        if let Some(a) = req.agent_md.as_ref() {
+            let _ = brain.set_agent_md(a);
+        }
+        if let Some(p) = req.persona.as_ref() {
+            let _ = brain.set_personality(p);
+        }
+        if let Some(s) = req.skills_md.as_ref() {
+            let _ = brain.set_skills_md(s);
+        }
+        let _ = brain.commit(Some("edited from dashboard"));
+    }
+    Ok(Json(serde_json::json!({ "ok": true })))
+}
+
 pub async fn brain(
     State(state): State<AppState>,
     Authed(user): Authed,