scaffold: add project CI and Docker templates under templates/project/_shared; update proposal and plan to include them

collab/proposals/01-codexhelper.llm.md

@@ -32,6 +32,8 @@
   - planning: architecture/module map documented; module implementations follow approved plan with no unplanned refactors
   - clean root: root remains minimal; scaffolding organizes assets under subdirectories
   - ci/containers: Gitea Actions and local Docker Compose run identical workflows; explicit names and cleanup verified
+  - project CI: scaffold includes `.gitea/workflows/ci.yml`, `docker/compose.yml`, `docker/test/Dockerfile`, and `scripts/test.docker.sh`
+  - ci/containers: Gitea Actions and local Docker Compose run identical workflows; explicit names and cleanup verified
 \n+## Approval — Tick All That Apply
 
 - Subcommands approved: `new-project`, `run`, `new-mode` [ ]