Thin the app's comments

The same pass the server had, on the Kotlin side: comments restating what
the code says are gone, and the ones recording a measurement, a constraint
or an incident are kept but cut to a few lines each. 6540 comment lines to
5674, and 920 lines off the app.

Two doc comments had drifted onto the item above the one they describe --
`contextAfter`'s onto `sessionWorking` in Events.kt, and `UsageMonitor`'s
equivalent on the server was fixed in the previous commit. Each is back on
its own item, which is the only non-comment line this diff moves.

The comments are reflowed to the column limit at their own indentation:
several were written wide, and ktfmt re-wrapped them into lines holding a
single orphan word. `/tmp` script, not kept -- ktfmt is idempotent over the
result, which is the check.

Left alone deliberately: this codebase's remaining comment density is high
because the comments carry things the code cannot say -- what a null means,
what a number was measured against, which bug a guard exists for. Of the
238 one-line doc comments in the app, five were pure restatement of the
name and were removed; the rest each say something the signature does not.

ktfmtFormat, compileDebugKotlin, lintDebug and testDebugUnitTest pass;
cargo test (127), clippy --all-targets and fmt still clean.

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

app/androidApp/src/main/kotlin/com/example/aiapp/Attachment.kt

@@ -28,8 +28,8 @@ fun attachmentName(ref: String): String = ref.substringAfter('-', ref)
 
 /**
  * One attachment on a sent message, drawn as what it is: an image inline, a file as its name. A
- * file is not fetched -- there is nothing on this phone to open a trace or a log with -- so the
- * name is the whole of it.
+ * file is not fetched -- there is nothing on this phone to open a trace with -- so the name is all
+ * of it.
  */
 @Composable
 fun Attachment(
@@ -50,8 +50,7 @@ fun Attachment(
 
 /**
  * A file's name, one line, in the face names are read in. Overlong names lose their middle: a name
- * is identified by both ends -- what it is at the front, what kind at the back -- and either
- * ellipsis alone takes away one of them.
+ * is identified by both ends -- what it is at the front, what kind at the back.
  */
 @Composable
 fun FileName(name: String, modifier: Modifier = Modifier) {