fix(test): trim the seven over-wall 1700s timeouts to the 1500s physical ceiling

1,700,000ms (28.3 min) exceeded every wall these tests run inside: the
25-min CI job timeout and the 1800s sharded-runner wall (which also
leaves --retry 1 zero room for a second attempt). Budget above the wall
is fiction, not headroom — a test that actually used it produced a
job-level kill (no bun summary, no artifact) instead of a clean
per-test timeout. No recorded p95 exists for this family (they are
being retiered to periodic in the re-platform wave); the trim stops at
the physical ceiling rather than guessing lower. Final policy lands in
the Wave-2 eval-budgets constants module.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/skill-e2e-plan-devex-finding-count.test.ts

@@ -132,6 +132,6 @@ describeE2E('/plan-devex-review per-finding AskUserQuestion count (periodic)', (
         }
       }
     },
-    1_700_000,
+    1_500_000 /* physical ceiling: the 25-min CI job + 1800s shard wall cap what can actually execute */,
   );
 });