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, 2 insertions, 0 deletions

diff --git a/makima/src/daemon/api/contract.rs b/makima/src/daemon/api/contract.rs
index 445d676..7c76b40 100644
--- a/makima/src/daemon/api/contract.rs
+++ b/makima/src/daemon/api/contract.rs
@@ -69,6 +69,8 @@ pub struct CreateContractRequest {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub local_only: Option<bool>,
     #[serde(skip_serializing_if = "Option::is_none")]
+    pub auto_merge_local: Option<bool>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub red_team_enabled: Option<bool>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub red_team_prompt: Option<String>,