bxctl audit verify: name the log-like files it did not check

A .jsonl file whose name is not a date is ignored by brokerd and by verify;
it is now listed, so "ok" does not seem to cover it.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

crates/bxctl/tests/verify_skipped.rs

@@ -0,0 +1,38 @@
+//! `bxctl audit verify` says which files in `audit/` it did not read: a file that looks like a
+//! log but is not named as one is ignored by `brokerd` too, and "ok" must not seem to cover it.
+
+use std::path::PathBuf;
+
+fn home(tag: &str) -> PathBuf {
+    let dir = std::env::temp_dir().join(format!("bx-verify-skip-{tag}-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&dir);
+    std::fs::create_dir_all(dir.join("audit")).unwrap();
+    let fixture =
+        PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("../proto/tests/fixtures/audit/good");
+    for entry in std::fs::read_dir(fixture).unwrap() {
+        let entry = entry.unwrap();
+        std::fs::copy(entry.path(), dir.join("audit").join(entry.file_name())).unwrap();
+    }
+    dir
+}
+
+#[test]
+fn a_stray_jsonl_file_is_named_and_the_log_still_verifies() {
+    let dir = home("stray");
+    std::fs::write(dir.join("audit/2026-0x-19.jsonl"), "x\n").unwrap();
+    std::fs::write(dir.join("audit/notes.txt"), "not a log\n").unwrap();
+    let mut out = Vec::new();
+    let ok = bxctl::verify::run(&dir, &mut out).unwrap();
+    let text = String::from_utf8(out).unwrap();
+    assert!(ok, "{text}");
+    assert!(text.starts_with("audit: ok, 10 records"), "{text}");
+    assert!(
+        text.contains("not an audit log file, not checked: 2026-0x-19.jsonl"),
+        "{text}"
+    );
+    assert!(
+        !text.contains("notes.txt"),
+        "only files that look like logs: {text}"
+    );
+    let _ = std::fs::remove_dir_all(&dir);
+}