v363

• Completed the migration of build-failure classification off the legacy global ERR trap onto the call-site failure-classification framework. (#1764)
• Replaced the classifying ERR trap in bin/compile with a single generic fallback handler. (#1764)
• Removed the post-failure "tip" warnings that ran after any failed build. (#1764)
• Build warnings and failure messages now print to stderr. (#1764)