feat: committer distinguishes recoverable vs unrecoverable failures

CommitterMeta is now a 3-way discriminated union:
- committed: success with branch + commitSha
- recoverable: coder can fix (hook failures, lint, test, conflicts)
- unrecoverable: can't be fixed by code (auth, permissions, disk)

Moderator routes recoverable → coder for retry.

packages/workflow-template-solve-issue/src/moderator.ts

@@ -31,6 +31,9 @@ export const solveIssueModerator: Moderator<SolveIssueMeta> = (ctx) => {
   }
 
   if (last.role === "committer") {
+    if (last.meta.status === "recoverable" && ctx.steps.length < maxRounds - 1) {
+      return "coder";
+    }
     return END;
   }