add review classifier rules for this repo

Eight classifications in .hyperhive/review-classifier.yml: no AI
advertising in commit messages, no committed secrets, no clippy
allow attributes, no debug leftovers, no dead code, tests with
behaviour changes, docs with operator-facing changes, one purpose per PR.

A swarm-controller test parses the real file so it can't rot, and the
rust source fileset in nix/rust.nix includes it so the test finds it
in the build sandbox.

swarm-controller/src/review_classifier.rs

@@ -1087,6 +1087,30 @@ classifications:
         assert_eq!(parse_rules(json_path, json.as_bytes()), Ok(want));
     }
 
+    #[test]
+    fn this_repos_own_rules_file_loads() {
+        let [yml_path, _] = RULES_PATHS;
+        let rules = parse_rules(
+            yml_path,
+            include_str!("../../.hyperhive/review-classifier.yml").as_bytes(),
+        )
+        .expect("the repo's rules file parses");
+        let names: Vec<_> = rules.iter().map(|c| c.name.as_str()).collect();
+        assert_eq!(
+            names,
+            [
+                "no-ads",
+                "no-secrets",
+                "no-lint-suppression",
+                "no-debug-leftovers",
+                "no-dead-code",
+                "tests-with-behaviour",
+                "docs-updated",
+                "one-purpose",
+            ]
+        );
+    }
+
     #[test]
     fn a_bad_rules_file_is_an_error_in_either_format() {
         let mut unknown_rule_field = datetime();