memoryd: a staged write's id counts every write staged that day

crates/memoryd/src/review.rs

@@ -92,8 +92,8 @@ pub fn submit(
 ) -> Result<String, String> {
     // 1. `args.check()?`.
     // 2. `day` is the first 10 characters of `ctx.now.to_rfc3339()`. `taken` = how many Waiting
-    //    lines have an id starting format!("p-{day}-"). The id is format!("p-{day}-{:04}", taken +
-    //    1).
+    //    lines of `lines(store)?`, done or not, have an id starting format!("p-{day}-"): an id is
+    //    never used twice. The id is format!("p-{day}-{:04}", taken + 1).
     // 3. `add` a Waiting line: id, time `ctx.now.to_rfc3339()`, session, call and taint from ctx,
     //    arguments as given.
     // 4. Ok(format!("waiting for the owner's review ({id}); nothing is changed until it is
@@ -101,7 +101,7 @@ pub fn submit(
     args.check()?;
     let rfc = ctx.now.to_rfc3339();
     let day = rfc.get(..10).unwrap_or("0000-00-00");
-    let taken = waiting(store)?
+    let taken = lines(store)?
         .iter()
         .filter(|line| match line {
             Line::Waiting { id, .. } => id.starts_with(&format!("p-{day}-")),