- Restrict the extension-add active-integration fallback to projects
with no recorded active key at all. A recorded but unsupported key
(e.g. "generic", deliberately excluded from AGENT_CONFIGS) no longer
falls back to registering every detected agent.
- Apply the same single-active rule to preset command overrides:
PresetManager._register_commands now scopes registration to the
active integration via only_agent.
- Add PresetManager.register_enabled_presets_for_agent, mirroring
ExtensionManager.register_enabled_extensions_for_agent, and call it
from integration use/switch/upgrade (active only) alongside the
existing extension re-registration so presets are rescaffolded on
activation instead of being written for inactive integrations.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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