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/ingest.rs

@@ -30,9 +30,7 @@ pub async fn run(engine: mpsc::Sender<EngineMessage>) {
     }
 }
 
-/// Identifies a specific file instance on disk, so a recreated path (e.g. a
-/// tailed process restarting and reopening its log file) can be told apart from
-/// the same file simply growing.
+/// Identifies a specific file instance on disk, so a recreated path can be told apart from the same file simply growing.
 #[derive(PartialEq, Eq, Clone, Copy)]
 struct FileId(#[cfg(unix)] u64, #[cfg(not(unix))] ());
 
@@ -55,13 +53,9 @@ async fn open(path: &Path) -> Option<(File, FileId)> {
     Some((file, file_id(&meta)))
 }
 
-/// Tails `path` like `tail -f`: reads existing content, then keeps reading as
-/// new lines are appended. If the file is deleted and recreated at the same
-/// path (or truncated in place) — e.g. the tailed process restarted and
-/// reopened its log — tailing resumes against the new file from its start,
-/// rather than exiting or getting stuck. `sequence` keeps incrementing across
-/// a recreation event; it's ottyl's own line counter, not tied to the source
-/// file.
+/// Tails `path` like `tail -f`, resuming from the start if the file is deleted/recreated or
+/// truncated in place rather than exiting or getting stuck; `sequence` keeps incrementing
+/// across a recreation since it's ottyl's own line counter, not tied to the source file.
 pub async fn run_file(engine: mpsc::Sender<EngineMessage>, path: PathBuf) {
     let mut sequence: u64 = 0;
 
@@ -81,9 +75,7 @@ pub async fn run_file(engine: mpsc::Sender<EngineMessage>, path: PathBuf) {
             let mut chunk = String::new();
             match reader.read_line(&mut chunk).await {
                 Ok(0) => {
-                    // EOF: decide whether the file was truncated/recreated
-                    // (tail the new instance from scratch) or just hasn't
-                    // grown yet (keep polling).
+                    // EOF: decide whether the file was truncated/recreated or just hasn't grown yet.
                     match tokio::fs::metadata(&path).await {
                         Ok(meta) => {
                             let new_id = file_id(&meta);
@@ -93,8 +85,7 @@ pub async fn run_file(engine: mpsc::Sender<EngineMessage>, path: PathBuf) {
                             id = new_id;
                         }
                         Err(_) => {
-                            // Path gone (mid-recreation); wait for it to
-                            // reappear and reopen fresh.
+                            // Path gone (mid-recreation); wait for it to reappear and reopen fresh.
                         }
                     }
                     tokio::time::sleep(POLL_INTERVAL).await;
@@ -119,8 +110,7 @@ pub async fn run_file(engine: mpsc::Sender<EngineMessage>, path: PathBuf) {
                             return;
                         }
                     }
-                    // else: partial line at EOF (write in progress) — keep
-                    // buffering and read again without treating it as final.
+                    // else: partial line at EOF (write in progress) — keep buffering.
                 }
                 Err(_) => continue 'reopen,
             }
@@ -189,7 +179,6 @@ mod tests {
 
         assert_eq!(recv_text(&mut rx).await, "long line before truncation");
 
-        // Truncate in place (same inode, shorter content) then write new data.
         let mut f = std::fs::OpenOptions::new()
             .write(true)
             .truncate(true)