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Fix a valid finding from GitHub Copilot's review of HEAD b9d9053 (#2948):
register_enabled_presets_for_agent() normalizes a legacy flat-list
registered_skills value (predating per-agent provenance) to the
{agent_name: [...]} dict shape in memory via _normalize_registered_skills,
but the persistence check only compared the two *normalized* forms. When
the freshly rescaffolded skill names are identical to what the legacy
list already held — the common case, since nothing about the preset or
skill actually changed — that comparison is a no-op and registry.update()
is skipped, leaving the *raw* on-disk value as the un-migrated flat list.
A later switch to a different skill-mode agent and removal then follows
_unregister_skills's legacy best-effort path (restore only the currently
active agent's directory) instead of the per-agent provenance path,
permanently orphaning the first agent's override.
Fix: track the raw (pre-normalization) existing value and force
persistence whenever it's a non-empty list, independent of whether the
normalized content changed. Traced registered_commands for the same
class of bug: its registry value has always been Dict[str, List[str]]
(no legacy flat-list format ever existed for it — the existing
`if not isinstance(existing_commands, dict): existing_commands = {}`
guard is not a lossy migration path), so this fix stays scoped to
registered_skills only.
Added red-first regression test
test_rescaffold_migrates_legacy_flat_list_registered_skills: installs a
preset, overwrites its registry entry with a raw legacy flat list,
rescaffolds the *same* active agent with unchanged skill names, and
asserts the raw registry is migrated to per-agent dict form. Extends the
scenario with a switch to a second skill-mode agent and preset removal
to prove both agents' directories restore cleanly instead of orphaning
the first. Failed against the prior code (raw value stayed a list) and
passes after the fix.
Targeted (tests/test_presets.py, tests/test_extensions.py: 692 passed)
and full (3938 passed, 109 skipped) suites and ruff check on changed
files pass clean.
Assisted-by: GitHub Copilot (model: Claude Sonnet 5, autonomous)
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>