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_infer_legacy_skill_provenance() only probed agents whose registrar config statically declares extension == "/SKILL.md", excluding command-backed agents (e.g. Copilot) that can also render preset overrides as SKILL.md files when ai_skills is enabled. A real preset-owned .github/skills/.../SKILL.md written while Copilot was the active skills-mode agent was therefore never probed and got misattributed entirely to whichever agent activated first after the upgrade, permanently orphaning Copilot's override on later removal. Broaden the candidate set to every configured integration (CommandRegistrar.AGENT_CONFIGS), reusing the existing safe-path helper (_safe_skills_dir_for_agent, itself built on the shared _get_skills_dir resolver) rather than inventing new path-construction logic. The existing preset-marker match (metadata.source == "preset:<pack_id>") continues to gate every attribution, so command-mode agents that never rendered this preset's skill are not falsely attributed. Add red-first regression tests: a legacy flat-list entry owned by Copilot in skills mode, switched directly to Claude with no intervening Copilot rescaffold, now migrates to a per-agent dict covering both agents, and removal restores both agents' files instead of orphaning Copilot's override; plus a negative-case test confirming a command-mode Copilot with no preset-owned skill marker is not falsely attributed during the same migration. Assisted-by: GitHub Copilot (model: Claude Sonnet 5, autonomous) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>