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Add sanitizeLoneSurrogates (regex-based UTF-16 lone-half cleaner) and sanitizeReplacer (JSON.stringify replacer that runs the cleaner on every string field during encoding). Split handleCommandInternal into handleCommandInternalImpl (raw) plus a thin sanitizing wrapper. The wrapper applies sanitizeLoneSurrogates to cr.result so both single-command (handleCommand line 1034) and batch-loop (line 1966) egress paths inherit it. Inline INVARIANT comment near the wrapper documents the architectural constraint. Both SSE producers (activity feed at /activity/stream and inspector stream) stringify with sanitizeReplacer. Post-stringify regex is ineffective on those paths because JSON.stringify has already converted the lone surrogate into the escape sequence "\\\\uD800" before any regex could match it; the replacer runs during stringify on the raw string value, so the substitution lands. Originated from @realcarsonterry PR #1463 (handleCommand-only wrap). Architectural lift to handleCommandInternal + SSE coverage authored on this branch. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>