fix: three errors that ended with the wrong exit code

Found compiling the environment-variable table for AGENTS.md:
- A REVIEW_GATES_MEM_RESERVE_MB that is no number threw
  std::invalid_argument, which nothing caught: the process aborted where
  it should end with a ValueError, exit 1. nan and inf were an unchecked
  cast. They raise ValueError / OverflowError now; a value past int64
  saturates.
- An env file that is not UTF-8: `run` ended with exit 1 where its
  preflight should stop it (exit 3), and `seats` parsed the raw bytes. Both
  read it as strict UTF-8 text now.
- A broker address with a port past 65535 was cut to 16 bits; it is an
  OverflowError now, uncaught (exit 1).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

implementations/Crafter.Review-Run.cpp

@@ -620,7 +620,10 @@ namespace Crafter::Review::Run {
         } catch (const std::invalid_argument& e) {
             Die(e.what());
         } catch (const Dyn::Error& e) {
-            if (e.Kind() != "FileNotFoundError" && e.Kind() != "PermissionError" && e.Kind() != "IsADirectoryError" && e.Kind() != "OSError") throw;
+            // The errors that mean the file could not be read: the OS errors, a
+            // file that is not UTF-8 (UnicodeDecodeError), and ValueError.
+            constexpr std::array<std::string_view, 6> Caught = {"FileNotFoundError", "PermissionError", "IsADirectoryError", "OSError", "UnicodeDecodeError", "ValueError"};
+            if (!std::ranges::contains(Caught, e.Kind())) throw;
             Die(e.what());
         }
         // The board (2026-10-31): the other drivers on this machine, what they