Plugin integration tests (install → configure → use)

[Hey-Yetunde]

Problem

Plugin units are tested in isolation; end-to-end flows are not.

Context

Manifest/registry/capability tests exist (tests/test_plugins_manifest.py, tests/test_capabilities.py).

Technical requirements

• Add integration tests: install a plugin (temp dir manifest) → register → grant capabilities in a workspace → subscribe to an event → emit → assert handler ran and results persisted.
• Cover a failing handler to confirm isolation end to end.

Acceptance criteria

• The full flow is covered without external services.

Testing requirements

• The integration tests.

Dependencies

• Plugin management API (when landed) or registry + capability store.

Difficulty

Medium

Priority

Medium