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
The merge completes Step 1 of agent provisioning approval followthrough, executing provisioning actions when approval decisions are made, with supporting documentation in AGENTS.md and docs/agents.md. Test coverage spans provisioning policy, approval routes, gating classifications, extension integra
Fusion-Task-Id: FN-3956
