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/ModelsScreen.kt

@@ -57,12 +57,9 @@ fun ModelsScreen(settings: ServerSettings, reloadToken: Int) {
             }
     }
 
-    // Polled rather than pushed: a download belongs to the machine, not to
-    // any session, so it has no event stream of its own. Slow enough not
-    // to matter, frequent enough that a bar moves.
-    // Keyed on the token as well, so the header's Refresh restarts the loop with a read now
-    // rather than leaving the reader watching for up to a second and a half to see whether
-    // anything happened.
+    // Polled rather than pushed: a download belongs to the machine, not to any session, so it has
+    // no event stream of its own. Keyed on the token as well, so the header's Refresh restarts the
+    // loop with a read now rather than leaving the reader watching for a second and a half.
     LaunchedEffect(reloadToken) {
         while (true) {
             reload()
@@ -186,11 +183,9 @@ fun ModelsScreen(settings: ServerSettings, reloadToken: Int) {
                                     }
                                 }
                             }
-                            // Inside the expanded repository's own item
-                            // rather than as a section after the list:
-                            // drawn after every card, a repository's files
-                            // read as belonging to whichever card happened
-                            // to be last.
+                            // Inside the expanded repository's own item rather than as a section
+                            // after the list: drawn after every card, a repository's files read as
+                            // belonging to whichever card happened to be last.
                             if (open) {
                                 when (val files = repoFiles) {
                                     null -> {}
@@ -257,15 +252,15 @@ private fun DownloadCard(download: Download, onCancel: () -> Unit) {
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
             )
             Spacer(Modifier.height(8.dp))
-            // A determinate bar only when the size is known. The server
-            // sends no total when it was never told one, and a bar drawn
-            // from a guess is worse than one that admits it is counting.
+            // A determinate bar only when the size is known. The server sends no total when it was
+            // never told one, and a bar drawn from a guess is worse than one that admits it is
+            // counting.
             if (download.total != null && download.total > 0) {
                 LinearProgressIndicator(
                     progress = { download.done.toFloat() / download.total.toFloat() },
                     // Blue at every value, unlike a quota bar: a download nearing its end is
-                    // nearing success, and colouring it like a limit being approached would say
-                    // the opposite of what is happening.
+                    // nearing success, and colouring it like a limit being approached would say the
+                    // opposite.
                     color = progressColor,
                     modifier = Modifier.fillMaxWidth(),
                 )
@@ -327,8 +322,8 @@ private fun RepoRow(repo: RemoteRepo, expanded: Boolean, onToggle: () -> Unit) {
                     repo.id,
                     style = MaterialTheme.typography.titleSmall,
                     maxLines = 1,
-                    // The owner is the part that repeats; the model name at
-                    // the end is what tells two entries apart.
+                    // The owner is the part that repeats; the model name at the end is what tells
+                    // two entries apart.
                     overflow = TextOverflow.StartEllipsis,
                 )
                 Text(
@@ -356,11 +351,9 @@ private fun RepoFileRow(file: RemoteFile, downloading: Boolean, onDownload: () -
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
             )
         }
-        // Disabled rather than absent, so the row reads the same whether
-        // this one is absent, already here, or on its way. Offering
-        // "Download" for a file that is downloading would be a button that
-        // does nothing anyone can see -- the server joins the running
-        // download rather than starting a second.
+        // Disabled rather than absent, so the row reads the same whether this one is absent,
+        // already here, or on its way. Offering "Download" for a file that is downloading would be
+        // a button that does nothing anyone can see.
         TextButton(enabled = !file.have && !downloading, onClick = onDownload) {
             Text(
                 when {