Trim comments across Rust and webapp source to direct one-liners (ticket 030)

Pass over src/*.rs, webapp/src/**, and the in-app "?" docs prose:
condensed multi-paragraph doc comments to single lines that state the
non-obvious why, deleted comments that only restated adjacent code, and
tightened the Docs.tsx help-panel wording. No logic, structure, or code
formatting changed — verified via cargo test (143 passed) and
tsc -b && vite build.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o

src/main.rs

@@ -31,14 +31,11 @@ struct Args {
     #[arg(long, default_value_t = 0)]
     port: u16,
 
-    /// Path to the settings file. Defaults to a per-OS config location
-    /// (e.g. `~/.config/ottyl/settings.json` on Linux).
+    /// Path to the settings file. Defaults to a per-OS config location.
     #[arg(long)]
     settings_path: Option<PathBuf>,
 
-    /// File to tail for log lines, instead of reading from stdin. Behaves like
-    /// `tail -f`: reads existing content then keeps following appended lines,
-    /// and keeps tailing if the file is deleted/recreated at the same path.
+    /// File to tail for log lines, instead of reading from stdin. Behaves like `tail -f`.
     #[arg(long)]
     file: Option<PathBuf>,
 }
@@ -60,13 +57,8 @@ async fn main() {
         let _ = engine_tx.send(engine::EngineMessage::SetMaxLogs(max_logs)).await;
     }
 
-    // Ticket 009: reload the active profile's param/metric declarations into the
-    // engine BEFORE starting ingest below. Ordering matters: declarations must be
-    // in place before any line is ingested so that backfill/live-derivation
-    // semantics (ticket 003) apply uniformly to every line, including ones that
-    // arrive immediately once ingest starts (there's no "declare after the fact
-    // and go back to reprocess early lines" step, so doing it after ingest starts
-    // could silently miss lines that raced ahead of the declarations).
+    // Reload the active profile's declarations before ingest starts: there's no way to
+    // reprocess early lines later, so declaring after ingest starts could miss lines that raced ahead.
     {
         let (active_profile_name, profiles_dir) = {
             let mut settings_guard = settings.lock().unwrap();