Prepare the Seriatim source installation plan

docs/roadmap/features/0001-seriatim-source-installation.md

@@ -93,6 +93,8 @@ manifests use immutable release tags.
 - Go is installed from Snap with classic confinement. Builds use the local
   toolchain with `GOTOOLCHAIN=local` rather than allowing automatic toolchain
   downloads.
+- `community.general` is an approved dependency and provides Snap management;
+  its version is pinned in the role's collection requirements.
 - The suite standardizes on Go channel `1.26/stable`, even though Seriatim's
   current `go.mod` requires Go 1.25.
 - Builds use `GOWORK=off`, `CGO_ENABLED=0`, and `-trimpath`.