Remove chain supervisor capability

Chains no longer spawn a supervisor task. Checkpoint contracts will be
automatically run as part of the DAG execution when dependencies complete.

- Remove supervisor task creation from start_chain handler
- Remove chain supervisor CLI commands
- Remove supervisor_task_id from StartChainResponse
- Remove withSupervisor option from frontend

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2 files changed, 2 insertions, 22 deletions

diff --git a/makima/src/db/models.rs b/makima/src/db/models.rs
index 0b8ef43..4e569ec 100644
--- a/makima/src/db/models.rs
+++ b/makima/src/db/models.rs
@@ -3064,14 +3064,11 @@ pub struct UpdateContractDefinitionRequest {
     pub editor_y: Option<f64>,
 }
 
-/// Request to start a chain
+/// Request to start a chain (kept for backwards compatibility)
 #[derive(Debug, Clone, Deserialize, ToSchema)]
 #[serde(rename_all = "camelCase")]
 pub struct StartChainRequest {
-    /// Whether to create a supervisor task that monitors chain progress
-    #[serde(default)]
-    pub with_supervisor: bool,
-    /// Repository URL for the supervisor task to work with
+    /// Repository URL (reserved for future use)
     pub repository_url: Option<String>,
 }
 
@@ -3080,7 +3077,6 @@ pub struct StartChainRequest {
 #[serde(rename_all = "camelCase")]
 pub struct StartChainResponse {
     pub chain_id: Uuid,
-    pub supervisor_task_id: Option<Uuid>,
     /// Root contracts created (those with no dependencies)
     pub contracts_created: Vec<Uuid>,
     pub status: String,
diff --git a/makima/src/db/repository.rs b/makima/src/db/repository.rs
index fb430ab..ec233ba 100644
--- a/makima/src/db/repository.rs
+++ b/makima/src/db/repository.rs
@@ -5687,22 +5687,6 @@ pub async fn get_chain_definition_graph(
     }))
 }
 
-/// Set the supervisor task ID for a chain.
-pub async fn set_chain_supervisor_task(
-    pool: &PgPool,
-    chain_id: Uuid,
-    supervisor_task_id: Option<Uuid>,
-) -> Result<(), sqlx::Error> {
-    sqlx::query(
-        "UPDATE chains SET supervisor_task_id = $2, updated_at = NOW() WHERE id = $1",
-    )
-    .bind(chain_id)
-    .bind(supervisor_task_id)
-    .execute(pool)
-    .await?;
-    Ok(())
-}
-
 /// Update chain status.
 pub async fn update_chain_status(
     pool: &PgPool,