fix(workflow): add activity timeouts to prevent BadScheduleActivityAttributes

All ExecuteActivity calls were missing StartToCloseTimeout and
ScheduleToCloseTimeout, causing 'BadScheduleActivityAttributes' errors.

- Added 10min timeout for git operations (clone, worktree, push, merge)
- Added 30min timeout for LLM activities (implementer, which calls Claude)
- Git operations use shared ctxWithOptions context
- LLM activities get their own implCtx with longer timeout
- Added time import

statemachine/orchestrator.go

@@ -5,6 +5,7 @@ import (
 	"io/ioutil"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"go.temporal.io/sdk/workflow"
 )
@@ -18,8 +19,14 @@ func OrchestratorWorkflow(ctx workflow.Context, in OrchestratorInput) (Orchestra
 	}
 
 	// Step 1: Clone the repository
+	activityOptions := workflow.ActivityOptions{
+		StartToCloseTimeout: 10 * time.Minute,
+		ScheduleToCloseTimeout: 15 * time.Minute,
+	}
+	ctxWithOptions := workflow.WithActivityOptions(ctx, activityOptions)
+	
 	cloneErr := workflow.ExecuteActivity(
-		ctx,
+		ctxWithOptions,
 		"CloneRepoActivity",
 		map[string]interface{}{
 			"RemoteURL":      in.RemoteURL,
@@ -55,7 +62,7 @@ func OrchestratorWorkflow(ctx workflow.Context, in OrchestratorInput) (Orchestra
 		// Add worktree
 		var worktreePath string
 		wtErr := workflow.ExecuteActivity(
-			ctx,
+			ctxWithOptions,
 			"GitWorktreeAddActivity",
 			map[string]interface{}{
 				"RepoPath": in.TargetRepoPath,
@@ -67,10 +74,16 @@ func OrchestratorWorkflow(ctx workflow.Context, in OrchestratorInput) (Orchestra
 			continue // Skip this task on error
 		}
 
-		// Call implementer to generate code
+		// Call implementer to generate code (longer timeout for LLM calls)
+		implOptions := workflow.ActivityOptions{
+			StartToCloseTimeout: 30 * time.Minute,
+			ScheduleToCloseTimeout: 35 * time.Minute,
+		}
+		implCtx := workflow.WithActivityOptions(ctx, implOptions)
+		
 		var implOutput map[string]interface{}
 		implErr := workflow.ExecuteActivity(
-			ctx,
+			implCtx,
 			"ImplementerActivity",
 			map[string]interface{}{
 				"TaskID":       taskID,
@@ -91,7 +104,7 @@ func OrchestratorWorkflow(ctx workflow.Context, in OrchestratorInput) (Orchestra
 
 		// Commit changes
 		commitErr := workflow.ExecuteActivity(
-			ctx,
+			ctxWithOptions,
 			"GitCommitActivity",
 			map[string]interface{}{
 				"WorktreePath": worktreePath,
@@ -106,7 +119,7 @@ func OrchestratorWorkflow(ctx workflow.Context, in OrchestratorInput) (Orchestra
 
 	// Step 4: Push to remote
 	pushErr := workflow.ExecuteActivity(
-		ctx,
+		ctxWithOptions,
 		"GitPushActivity",
 		map[string]interface{}{
 			"RepoPath": in.TargetRepoPath,
@@ -125,7 +138,7 @@ func OrchestratorWorkflow(ctx workflow.Context, in OrchestratorInput) (Orchestra
 	}
 
 	mergeErr := workflow.ExecuteActivity(
-		ctx,
+		ctxWithOptions,
 		"GitSquashMergeActivity",
 		map[string]interface{}{
 			"RepoPath": in.TargetRepoPath,