Record the loose end the taskNote outage exposed, and the last of its checks

A session whose transcript will not parse is skipped with only a log line, so
from the phone it is indistinguishable from an idle unresponsive one. That is
why the outage needed a report from Bryan rather than showing itself. The
cause is fixed; the class is not, and it is the "design the unknown state
first" rule rather than a bug in one code path.

Also rustfmt on the parse path, which the fix landed unformatted.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

server/src/session/transcript.rs

@@ -353,9 +353,8 @@ impl<'a> Indexed<'a> {
                     #[serde(rename = "type")]
                     kind: Option<String>,
                 }
-                let place: JustPlace = serde_json::from_str(line).with_context(|| {
-                    format!("bad transcript line in {}", self.path.display())
-                })?;
+                let place: JustPlace = serde_json::from_str(line)
+                    .with_context(|| format!("bad transcript line in {}", self.path.display()))?;
                 // Debug rather than a warning: a transcript written against a
                 // newer build has one of these per line it wrote, and the row
                 // on the phone is where this is actually reported.