Add auto_merge_local option for local-only contracts (#50)

When local_only=true on a contract, all completion actions are skipped.
This adds a new option auto_merge_local that, when enabled along with
local_only, will automatically merge completed task changes to the
master/main branch locally (without pushing or creating PRs).

Changes:
- Add auto_merge_local column to contracts table (migration)
- Add auto_merge_local field to Contract model and summary
- Update CreateContractRequest and UpdateContractRequest structs
- Update contract repository create/update functions
- Add auto_merge_local to WebSocket protocol StartTask command
- Pass auto_merge_local through spawn_task and run_task functions
- Modify task manager completion logic: if local_only=true AND
  auto_merge_local=true, execute 'merge' completion action locally
- Update all server handlers to retrieve and pass auto_merge_local
- Add TypeScript types to frontend components

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/makima/src/server/handlers/contract_chat.rs b/makima/src/server/handlers/contract_chat.rs
index a066595..b5255f5 100644
--- a/makima/src/server/handlers/contract_chat.rs
+++ b/makima/src/server/handlers/contract_chat.rs
@@ -1571,14 +1571,14 @@ async fn handle_contract_request(
                 }
             };
 
-            // Get local_only from contract if task has one
-            let local_only = if let Some(contract_id) = task.contract_id {
+            // Get local_only and auto_merge_local from contract if task has one
+            let (local_only, auto_merge_local) = if let Some(contract_id) = task.contract_id {
                 match repository::get_contract_for_owner(pool, contract_id, owner_id).await {
-                    Ok(Some(contract)) => contract.local_only,
-                    _ => false,
+                    Ok(Some(contract)) => (contract.local_only, contract.auto_merge_local),
+                    _ => (false, false),
                 }
             } else {
-                false
+                (false, false)
             };
 
             // Send SpawnTask command to daemon
@@ -1604,6 +1604,7 @@ async fn handle_contract_request(
                 patch_data: None,
                 patch_base_sha: None,
                 local_only,
+                auto_merge_local,
                 supervisor_worktree_task_id: None, // Not spawned by supervisor
             };
 
@@ -2593,6 +2594,7 @@ async fn handle_contract_request(
                 autonomous_loop: None,
                 phase_guard: None,
                 local_only: None,
+                auto_merge_local: None,
                 red_team_enabled: None,
                 red_team_prompt: None,
                 template_id: None,