Rename script/fetch-policy to script/commit-current-upstream-policy-docs

sneak, on the PR: the script does more than fetch, and short names are
not wanted. The make target, the test names, the variables and the
messages take the new name. Behaviour is unchanged.

Model: opus-5-5

script/update-policy

@@ -1,12 +1,13 @@
 #!/bin/sh
 # script/update-policy: bring this repo up to standards. It fetches the
-# current script/fetch-policy from the prompts repo over HTTP, runs it
-# on this repo and commits the files it wrote. It does not push.
-# Identical in all repos. Our own extension to scripts-to-rule-them-all.
+# current script/commit-current-upstream-policy-docs from the prompts
+# repo over HTTP, runs it on this repo and commits the files it wrote.
+# It does not push. Identical in all repos. Our own extension to
+# scripts-to-rule-them-all.
 set -eu
 
 ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
-FETCH_POLICY_URL="https://git.eeqj.de/sneak/prompts/raw/branch/main/script/fetch-policy"
+COMMIT_CURRENT_UPSTREAM_POLICY_DOCS_URL="https://git.eeqj.de/sneak/prompts/raw/branch/main/script/commit-current-upstream-policy-docs"
 
 die() {
     echo "update-policy: $*" >&2
@@ -22,10 +23,11 @@ main() {
     trap 'rm -rf "$tmp"' EXIT
 
     curl --fail --silent --show-error --max-time 60 \
-        --output "$tmp/fetch-policy" "$FETCH_POLICY_URL" ||
-        die "cannot fetch $FETCH_POLICY_URL"
+        --output "$tmp/commit-current-upstream-policy-docs" \
+        "$COMMIT_CURRENT_UPSTREAM_POLICY_DOCS_URL" ||
+        die "cannot fetch $COMMIT_CURRENT_UPSTREAM_POLICY_DOCS_URL"
 
-    sh "$tmp/fetch-policy" "$ROOT" > "$tmp/written"
+    sh "$tmp/commit-current-upstream-policy-docs" "$ROOT" > "$tmp/written"
     commit="$(head -n 1 "$tmp/written")"
     paths="$(tail -n +2 "$tmp/written")"