REPO_POLICIES: apply the wordings from the latest compaction review

Applies the "Acceptable" wording of each of the seven findings at
#159 (comment), as
#159 (comment) says.

`TODO.md` carries the new size: 982 lines and 7,281 words.

Model: opus-5-5

TODO.md

@@ -22,7 +22,7 @@ fmt-check, and commit.
 # Completed Steps
 
 - 2026-11-09: Compacted `prompts/REPO_POLICIES.md` from 1,165 lines and 8,556
-  words to 973 lines and 7,265 words
+  words to 982 lines and 7,281 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