chore: replace all master branch references with main

- executor.go: merge story branch to main before deploy
- container.go: error messages reference git push origin main
- api/stories.go: create story branch from origin/main (drop master fallback)
- executor_test.go: test setup uses main branch

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/internal/executor/container.go b/internal/executor/container.go
index 8b244c6..95717b4 100644
--- a/internal/executor/container.go
+++ b/internal/executor/container.go
@@ -473,7 +473,7 @@ func detectUncommittedChanges(workspace string) error {
 	if err == nil {
 		for _, line := range strings.Split(strings.TrimSpace(string(diffOut)), "\n") {
 			if line != "" && !isScaffold(line) {
-				return fmt.Errorf("agent left uncommitted changes (work would be lost on sandbox deletion):\n%s\nInstructions must include: git add -A && git commit && git push origin master", strings.TrimSpace(string(diffOut)))
+				return fmt.Errorf("agent left uncommitted changes (work would be lost on sandbox deletion):\n%s\nInstructions must include: git add -A && git commit && git push origin main", strings.TrimSpace(string(diffOut)))
 			}
 		}
 	}
@@ -489,7 +489,7 @@ func detectUncommittedChanges(workspace string) error {
 			}
 		}
 		if len(dirty) > 0 {
-			return fmt.Errorf("agent left untracked files not committed (work would be lost on sandbox deletion):\n%s\nInstructions must include: git add -A && git commit && git push origin master", strings.Join(dirty, "\n"))
+			return fmt.Errorf("agent left untracked files not committed (work would be lost on sandbox deletion):\n%s\nInstructions must include: git add -A && git commit && git push origin main", strings.Join(dirty, "\n"))
 		}
 	}