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db78903dfb
Replace the "enumerate every skill-mode directory and restore all of them" approach from the previous round with precise per-agent provenance tracking, per reviewer feedback that the enumerate-and-restore-everything design was unsound: - registered_skills changes from a flat List[str] to Dict[str, List[str]] (agent name -> skill names actually written), mirroring the shape registered_commands already uses. _register_skills now returns this per-agent mapping instead of a bare list, and every call site (register_enabled_presets_for_agent, install_from_directory, the _reconcile_skills "was this skill previously managed" check) is updated to read/merge the new shape. Legacy flat-list registry entries from before this change are still readable: writes self-migrate the format, and _normalize_registered_skills() handles the transitional read paths. - _unregister_skills now restores exactly the agent directories recorded for a preset instead of guessing at every skill-mode integration that happens to exist on disk. This fixes two problems with the old enumerate-everything design: (1) it could silently overwrite or delete another preset's (or a user's) override in an agent directory the current preset never actually touched, and (2) it depended on transient per-process integration state (_skills_mode), which is unset in a fresh CLI invocation for mode-selectable integrations like Copilot --skills, permanently orphaning their overrides after a process restart. Registries written before this change (flat list, no agent provenance) fall back to best-effort restoration under only the currently active agent, matching the pre-existing guarantee level. - Every directory resolved from persisted provenance is now validated through the project's shared symlink/containment guard (_ensure_safe_shared_directory) before any file in it is read, written, or removed, since restoration may target an agent that isn't currently active and its directory can't be assumed safe just because a name was recorded for it. - _tracked_skill_agent_dirs() (the enumeration helper introduced last round) is removed; it's superseded by the provenance-based design. Adds regression tests: a symlinked skills directory is rejected during removal; removing one preset does not disturb a different preset's override in another agent's directory; and a Copilot --skills registration installed, then removed after switching agents in a fresh PresetManager instance (simulating a new process), is still correctly restored. Updates existing skill-registration assertions across test_presets.py and test_integration_claude.py for the new per-agent registry shape. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>