Say which Dockerfile stages run script/bootstrap (closes #90)

The bullet in `prompts/REPO_POLICIES.md` that requires a `Dockerfile` said every Dockerfile installs its prerequisites by running `script/bootstrap`, while the canonical Go `Dockerfile` never runs it.

The bullet now says the gate phases and the build stage start from their pinned base images and install what those images lack either inline, as the Go example does for `git`, or by running `script/bootstrap`, as the `prompts` repo's own `Dockerfile` does for its yarn packages. The development environment stage, the final stage of a non-server repo, runs `script/bootstrap`. The new repo checklist says the same.

Model: opus-5-5

TODO.md

@@ -21,6 +21,13 @@ fmt-check, and commit.
 
 # Completed Steps
 
+- 2026-10-04: `REPO_POLICIES.md` now says which `Dockerfile` stages run
+  `script/bootstrap` (issue 90). The gate phases and the build stage start from
+  their pinned base images and install what those images lack either inline, as
+  the canonical Go `Dockerfile` does for `git`, or by running
+  `script/bootstrap`, as this repo's own `Dockerfile` does for its yarn
+  packages. The development environment stage, the final stage of a non-server
+  repo, runs `script/bootstrap`. The new repo checklist says the same.
 - 2026-10-04: The canonical `.dockerignore` now also keeps out the git `config`
   of a submodule that keeps its own `.git` directory, which still reached the
   image (issue 88): both git patterns now carry the `**/` prefix. A submodule