M4a task 14: post's comment was now_ms's; fixed, and every comment read

A script that rewrote the skeleton's comments put `now_ms`'s text on `post`. Task 14's second
session saw the contradiction and deliberated until cut off. Both comments are fixed, each
todo!() comment in tasks 14 and 15 was read beside its signature, and both tasks now say to stop
and quote a comment that does not fit. Lesson T29.

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

docs/plans/M4a/files/crates/gatewayd/src/serve/handle.rs

@@ -14,15 +14,17 @@ use crate::ws::conn::Ws;
 
 /// Now, in Mattermost's milliseconds.
 fn now_ms() -> i64 {
-    // Milliseconds since the Unix epoch as i64, with try_from (i64::MAX if it does not fit).
+    // `let ms = SystemTime::now().duration_since(UNIX_EPOCH).map(|d| d.as_millis()).unwrap_or(0);`
+    // then `i64::try_from(ms).unwrap_or(i64::MAX)`.
     todo!()
 }
 
 impl Gateway {
     /// Post in a thread; a failure is logged, not fatal.
     pub(super) fn post(&self, channel: &str, root: &str, text: &str) {
-        // `SystemTime::now().duration_since(UNIX_EPOCH).map(|d| d.as_millis()).unwrap_or(0)`, then
-        // `i64::try_from(ms).unwrap_or(i64::MAX)`.
+        // `if let Err(e) = self.client.create_post(channel, root, text)`: log
+        //    "gatewayd: cannot post in <channel> (thread <root>): <e>", with `(self.log)(&line)`.
+        // Nothing else: posting records nothing in the state.
         todo!()
     }