docs: gate write-good.Passive on CI

Both blockers are done — #4548 (353 hits in hand-written docs) and
#4549 (46 hits in generated CLI reference docs, hivectl/swarmctl/hive-forge's
own clap help text) — and the previous commit suppresses the reviewed
false-positive remainder. vale --minAlertLevel=error docs now returns
0 errors, matching CI's existing prose-lint-errors job.

Closes #4546.

swarm-logs/src/main.rs

@@ -90,7 +90,12 @@ fn main() -> Result<()> {
             query::run(&cfg, &logsql, limit, format, &mut stdout.lock())
         }
         Verb::MarkdownDocs => {
-            print!("{}", clap_markdown::help_markdown::<Cli>());
+            // `show_footer(false)`: drop clap-markdown's own fixed
+            // "generated automatically by..." footer, same as
+            // hivectl/swarmctl/hive-forge — it's not our prose, and
+            // write-good.Passive has nothing to check it against.
+            let options = clap_markdown::MarkdownOptions::new().show_footer(false);
+            print!("{}", clap_markdown::help_markdown_custom::<Cli>(&options));
             Ok(())
         }
     }