Compact REPO_POLICIES.md without losing rules (closes #158)

The rules now sit under headings, the pinning rule first. Each rule that
was stated in several places is stated once. From 1,145 lines and 8,427
words to 1,012 lines and 7,709 words. Code blocks are unchanged, except
that the Makefile copies of the Go and Python test commands are gone:
the Dockerfile examples carry the same commands.

Both checklists name the `.golangci.yml` section.

Model: fable-5-1

TODO.md

@@ -26,6 +26,13 @@ fmt-check, and commit.
   says how `script/fmt`, `script/fmt-check` and `script/bootstrap` do it and
   pins `golines`. The Go style guide and both checklists say the same. `lll`
   stays at 88, since `golines` leaves long strings and comments as they are.
+- 2026-11-06: Compacted `prompts/REPO_POLICIES.md` from 1,145 lines and 8,427
+  words to 1,012 lines and 7,709 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
+  Python test commands are gone, because the `Dockerfile` examples carry the
+  same commands. Both checklists name the `.golangci.yml` section.
 - 2026-11-06: The pinning rule in `prompts/REPO_POLICIES.md` now opens with its
   scope: what we download and install ourselves in scripts and Dockerfiles
   (https://git.eeqj.de/sneak/prompts/issues/154). Distribution packages are