refactor(hawk): consume runtime-owned Eyrie transport selection

[Patel230]

Summary

• make Hawk consume Eyrie runtime selection and transport resolution instead of rebuilding provider decisions locally
• update review and config flows to use runtime-owned transport resolution
• align Hawk internal config wrappers and tests with the Eyrie-owned selection model
• update external/eyrie submodule pointer to the new runtime commit

Verification

• go test ./cmd ./internal/engine -count=1
• go test -race ./cmd ./internal/engine -count=1
• golangci-lint run ./cmd ./internal/engine ./internal/config ./internal/bridge/sight ./internal/types ./internal/multiagent --timeout=5m
• validated on clean branch against external/eyrie at commit 967ab85