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

collab/plan/01-codexhelper.md

@@ -24,7 +24,7 @@ Purpose: Deliver Phase 1 (Crawl) MVP of CodexHelper: subcommands, scaffolding, p
 - Implement creation with intake comments and overwrite safeguards.
 
 4) new-project (outside repo) (tests first)
-- Write tests for project directory creation, copying AGENTS.md, prompts, codex.yaml, codex.sh, and `.gitignore` content.
+- Write tests for project directory creation, copying AGENTS.md, prompts, codex.yaml, codex.sh, `.gitignore` content, and CI/containers artifacts (`.gitea/workflows/ci.yml`, `docker/compose.yml`, `docker/test/Dockerfile`, `scripts/test.docker.sh`).
 - Implement scaffolding and read-only copies under `prompts/_mode/`.
 
 5) run: compose + invoke (tests first)
@@ -57,7 +57,8 @@ Purpose: Deliver Phase 1 (Crawl) MVP of CodexHelper: subcommands, scaffolding, p
 - Precedence: CLI > env > project > mode > global.
 - `prompts/global/{system.md,system.llm.md}` are present and included in composition.
 - Running `CodexHelper run` or `new-project` inside this repo errors with guidance.
- - Tests: bats test suite covers all CLI paths and guardrails; tests pass locally; test runner script present.
+- Tests: bats test suite covers all CLI paths and guardrails; tests pass locally; test runner script present.
+ - Project CI: scaffold contains Gitea workflow and Docker artifacts for local parity.
 
 ## Assumptions/Risks
 - codex-cli flags may vary; we’ll design pass-through and document tested flags.