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## Why Global instruction behavior spans thread creation, resume, forks, subagents, and compaction. Characterization coverage is needed before changing those semantics so preserved history can be distinguished from newly loaded configuration. ## What changed - Extends the existing `agents_md` suite with fresh-thread, warning, resume, fork, and subagent lifecycle coverage. - Extends the existing `compact` suite with manual, mid-turn, and remote-v2 compaction coverage. - Asserts rendered instruction fragments, reported source paths, and structured request history before and after instruction-file mutations.