review: memory writes from a secret session are not written to Honcho

The journal now records each call's class (absent on the owner's undo and on
older lines, which still read). The mirror turns everything a secret write
would conclude or send to the fleet into one Skip, after its deletions, which
still go; a note whose own header says secret is skipped the same way.

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

crates/memoryd/src/review.rs

@@ -246,6 +246,7 @@ pub fn reject(store: &Store, id: &str, now: Timestamp) -> Result<String, String>
             untrusted: false,
             flag: None,
             undoes: Some(id.to_string()),
+            class: None,
         },
         now,
     )?;