Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Daan Vinken <daanvinken@tythus.com>

Author: daanvinken

server/core/runtime/s3_plan_store.go

@@ -144,9 +144,18 @@ func (s *S3PlanStore) Load(ctx command.ProjectContext, planPath string) error {
 	// Reject stale plans: the plan must have been created at the same commit
 	// the PR currently points to. This prevents applying outdated plans after
 	// new commits are pushed (e.g. across pod restarts).
-	// Note: S3 normalizes user-defined metadata keys to title case in responses,
-	// so "head-commit" (as written in Save) becomes "Head-Commit" here.
-	planCommit := resp.Metadata["Head-Commit"]
+	// the PR currently points to. This prevents applying outdated plans after
+	// new commits are pushed (e.g. across pod restarts).
+	// Note: different S3/S3-compatible implementations may return user-defined
+	// metadata keys with different casing, so we look up "head-commit"
+	// case-insensitively.
+	var planCommit string
+	for k, v := range resp.Metadata {
+		if strings.EqualFold(k, "head-commit") {
+			planCommit = v
+			break
+		}
+	}
 	if planCommit == "" {
 		return fmt.Errorf("plan in S3 has no head-commit metadata (key=%s) — run plan again", key)
 	}