REPO_POLICIES: fix the review findings on the compaction (#158)

Fixes the findings of the review of
#159.

- CI: "The workflow sets these:", so the four settings bind every
  repo's workflow again.
- node and yarn: a stage that needs no yarn copies no `yarn.lock`
  before it runs `script/bootstrap`, which is what the examples do.
- Dockerfile: names the stage to keep last, the one that ships.
- Version: "Without that check" replaces "Otherwise".
- The lists the review named are bulleted again, with the wording on
  `next`. The submodule examples are in their own sentence, as in both
  checklists.
- `TODO.md`: the entry carries the new size, 1,062 lines and 7,794
  words.

Model: fable-5-1

TODO.md

@@ -22,7 +22,7 @@ fmt-check, and commit.
 # Completed Steps
 
 - 2026-11-06: Compacted `prompts/REPO_POLICIES.md` from 1,145 lines and 8,427
-  words to 1,012 lines and 7,709 words
+  words to 1,062 lines and 7,794 words
   (https://git.eeqj.de/sneak/prompts/issues/158). Every rule keeps its meaning.
   The rules now sit under headings, the pinning rule first. Each rule that was
   stated in several places is stated once. The Makefile copies of the Go and