extension add registered commands for every detected agent, and
integration upgrade back-filled enabled extensions for non-active
integrations. Maintainer direction on #2948: treat the project as
single-active. Only the active integration gets extension artifacts;
use/switch rescaffold the target when the user selects it.
- extension add now routes through the all-agents pass restricted to
the active integration (only_agent), keeping detection and
missing-skills-dir recovery safeguards. Projects without recorded
init-options fall back to detection-based registration.
- integration upgrade re-registers extensions only when upgrading the
active integration, reversing the #2886 back-fill for non-active
targets at maintainer request.
Fixes#2948
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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