Completes FN-3976 by reclassifying GitHub import action gating in the engine's `gating-classifications.ts`, updating documentation in `docs/agents.md` accordingly, and adding test coverage across four gating test suites.
Fusion-Task-Id: FN-3976
Merges two new plugin packages — `fusion-plugin-even-cards` (board/card endpoints with API key auth) and `fusion-plugin-even-realities-glasses` (notifier, quick-capture, settings, transport, Fusion API client, and agent actions) — plus a substantial engine refactor that unifies agent action gating c
Fusion-Task-Id: FN-3751
