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/ServerConfig.kt

@@ -14,10 +14,9 @@ typealias ServerSettings = com.example.wgapplink.ServerSettings
 /**
  * This app's enrollment, which is the whole of what is product-specific about it.
  *
- * Both values are load-bearing and neither may be changed casually. The scheme is what routes a
- * scanned QR here rather than to Dev Updater, and the key alias names the Android Keystore key the
- * token is already sealed under on every enrolled phone -- changing it would leave those phones
- * reading as not enrolled, with no error to explain why.
+ * Both values are load-bearing. The scheme is what routes a scanned QR here rather than to Dev
+ * Updater, and the key alias names the Android Keystore key the token is already sealed under on
+ * every enrolled phone -- changing it would leave those phones reading as not enrolled.
  */
 private val store = ServerStore(scheme = "aiapp", keyAlias = "aiapp-token-key")