feat(tui): bracketed-paste config toggle + capacity hot-path bench

Closes #77, refs #75.

#77 — bracketed paste was unconditionally enabled at terminal init. Add a
\`bracketed_paste\` field to Settings (default true) and propagate it through
TuiOptions → App → run_tui / pause_terminal / resume_terminal so users on
the rare terminal that mishandles \`\e[?2004h\` can disable it via
\`/set bracketed_paste off\` or \`bracketed_paste = false\` in
\`~/.config/deepseek/settings.toml\`. Modern terminals continue to work as
before. All TuiOptions construction sites updated in one pass.

#75 — added an ignored-test microbench for \`compute_profile\` in
\`crates/tui/src/core/capacity.rs\`. Run with:
  cargo test -p deepseek-tui --release bench_compute_profile -- --ignored --nocapture

Baseline (release, M1):
  window=  16  per-call=  48ns
  window=  64  per-call= 126ns
  window= 256  per-call= 385ns
  window=1024  per-call=1438ns

Sub-µs at typical window sizes — no optimization shipped, bench locks in
the regression contract. No new dev-deps (uses std::time::Instant +
black_box, gated as #[ignore]).

crates/tui/src/commands/attachment.rs

@@ -75,6 +75,7 @@ mod tests {
                 allow_shell: false,
                 use_alt_screen: false,
                 use_mouse_capture: false,
+                use_bracketed_paste: true,
                 max_subagents: 1,
                 skills_dir: tmpdir.path().join("skills"),
                 memory_path: tmpdir.path().join("memory.md"),

crates/tui/src/commands/config.rs

@@ -437,6 +437,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: PathBuf::from("."),
             memory_path: PathBuf::from("memory.md"),

crates/tui/src/commands/core.rs

@@ -215,6 +215,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: PathBuf::from("/tmp/test-skills"),
             memory_path: PathBuf::from("memory.md"),

crates/tui/src/commands/debug.rs

@@ -128,6 +128,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: PathBuf::from("/tmp/test-skills"),
             memory_path: PathBuf::from("memory.md"),

crates/tui/src/commands/init.rs

@@ -166,6 +166,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: tmpdir.path().join("skills"),
             memory_path: tmpdir.path().join("memory.md"),

crates/tui/src/commands/mod.rs

@@ -526,6 +526,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: PathBuf::from("."),
             memory_path: PathBuf::from("memory.md"),

crates/tui/src/commands/note.rs

@@ -63,6 +63,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: tmpdir.path().join("skills"),
             memory_path: tmpdir.path().join("memory.md"),

crates/tui/src/commands/provider.rs

@@ -82,6 +82,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: PathBuf::from("."),
             memory_path: PathBuf::from("memory.md"),

crates/tui/src/commands/queue.rs

@@ -142,6 +142,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: tmpdir.path().join("skills"),
             memory_path: tmpdir.path().join("memory.md"),

crates/tui/src/commands/review.rs

@@ -76,6 +76,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: tmpdir.path().join("skills"),
             memory_path: tmpdir.path().join("memory.md"),

crates/tui/src/commands/session.rs

@@ -200,6 +200,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: tmpdir.path().join("skills"),
             memory_path: tmpdir.path().join("memory.md"),

crates/tui/src/commands/skills.rs

@@ -122,6 +122,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: tmpdir.path().join("skills"),
             memory_path: tmpdir.path().join("memory.md"),

crates/tui/src/commands/task.rs

@@ -55,6 +55,7 @@ mod tests {
                 allow_shell: false,
                 use_alt_screen: false,
                 use_mouse_capture: false,
+                use_bracketed_paste: true,
                 max_subagents: 2,
                 skills_dir: PathBuf::from("."),
                 memory_path: PathBuf::from("memory.md"),

crates/tui/src/core/capacity.rs

@@ -693,4 +693,40 @@ mod tests {
         assert_eq!(decision.action, GuardrailAction::NoIntervention);
         assert!(decision.cooldown_blocked);
     }
+
+    /// Hot-path microbench for `compute_profile`. Run with:
+    ///
+    /// ```text
+    /// cargo test -p deepseek-tui --release capacity::tests::bench_compute_profile -- --ignored --nocapture
+    /// ```
+    ///
+    /// Establishes a baseline cost so we can detect regressions when the
+    /// observation cadence is high (50+ message turns × per-step calls). Adds
+    /// no dev-deps; we measure with `Instant` and print rather than gating CI.
+    #[test]
+    #[ignore]
+    fn bench_compute_profile() {
+        use std::time::Instant;
+
+        for &window_len in &[16usize, 64, 256, 1024] {
+            let mut window: VecDeque<f64> = VecDeque::with_capacity(window_len);
+            for i in 0..window_len {
+                #[allow(clippy::cast_precision_loss)]
+                window.push_back((i as f64).sin() * 0.5);
+            }
+
+            let iters = 100_000usize;
+            let start = Instant::now();
+            for _ in 0..iters {
+                let profile = compute_profile(&window);
+                std::hint::black_box(profile);
+            }
+            let elapsed = start.elapsed();
+            let per_call_ns = elapsed.as_nanos() as f64 / iters as f64;
+            println!(
+                "compute_profile window={window_len:>4}  total={:?}  per-call={per_call_ns:>8.0}ns",
+                elapsed
+            );
+        }
+    }
 }

crates/tui/src/main.rs

@@ -2731,6 +2731,9 @@ async fn run_interactive(
     );
     let use_alt_screen = should_use_alt_screen(cli, config);
     let use_mouse_capture = should_use_mouse_capture(cli, config, use_alt_screen);
+    let use_bracketed_paste = crate::settings::Settings::load()
+        .map(|s| s.bracketed_paste)
+        .unwrap_or(true);
 
     tui::run_tui(
         config,
@@ -2740,6 +2743,7 @@ async fn run_interactive(
             allow_shell: cli.yolo || config.allow_shell(),
             use_alt_screen,
             use_mouse_capture,
+            use_bracketed_paste,
             skills_dir: config.skills_dir(),
             memory_path: config.memory_path(),
             notes_path: config.notes_path(),

crates/tui/src/settings.rs

@@ -21,6 +21,10 @@ pub struct Settings {
     pub low_motion: bool,
     /// Enable fancy footer animations (water-spout strip, pulsing text)
     pub fancy_animations: bool,
+    /// Enable terminal bracketed-paste mode. Default true. Disable if your
+    /// terminal mishandles the `\e[?2004h` escape (rare; some legacy
+    /// terminals over SSH+screen multiplex without the cap).
+    pub bracketed_paste: bool,
     /// Show thinking blocks from the model
     pub show_thinking: bool,
     /// Show detailed tool output
@@ -50,6 +54,7 @@ impl Default for Settings {
             calm_mode: false,
             low_motion: false,
             fancy_animations: false,
+            bracketed_paste: true,
             show_thinking: true,
             show_tool_details: true,
             composer_density: "comfortable".to_string(),
@@ -142,6 +147,9 @@ impl Settings {
             "fancy_animations" | "fancy" | "animations" => {
                 self.fancy_animations = parse_bool(value)?;
             }
+            "bracketed_paste" | "paste" => {
+                self.bracketed_paste = parse_bool(value)?;
+            }
             "show_thinking" | "thinking" => {
                 self.show_thinking = parse_bool(value)?;
             }
@@ -251,6 +259,7 @@ impl Settings {
         lines.push(format!("  calm_mode:          {}", self.calm_mode));
         lines.push(format!("  low_motion:         {}", self.low_motion));
         lines.push(format!("  fancy_animations:   {}", self.fancy_animations));
+        lines.push(format!("  bracketed_paste:    {}", self.bracketed_paste));
         lines.push(format!("  show_thinking:      {}", self.show_thinking));
         lines.push(format!("  show_tool_details:  {}", self.show_tool_details));
         lines.push(format!("  composer_density:   {}", self.composer_density));
@@ -286,6 +295,10 @@ impl Settings {
                 "fancy_animations",
                 "Fancy footer animations (water-spout strip): on/off",
             ),
+            (
+                "bracketed_paste",
+                "Terminal bracketed-paste mode: on/off (rare to disable)",
+            ),
             ("show_thinking", "Show model thinking: on/off"),
             ("show_tool_details", "Show detailed tool output: on/off"),
             (

crates/tui/src/tui/app.rs

@@ -321,6 +321,10 @@ pub struct TuiOptions {
     pub use_alt_screen: bool,
     /// Capture mouse input for internal scrolling/selection.
     pub use_mouse_capture: bool,
+    /// Enable terminal bracketed-paste mode (OSC `?2004h` / `?2004l`). Defaults
+    /// on; settable via `bracketed_paste = false` in `settings.toml` for the
+    /// rare terminal that mishandles it.
+    pub use_bracketed_paste: bool,
     /// Maximum number of concurrent sub-agents.
     pub max_subagents: usize,
     #[allow(dead_code)]
@@ -397,6 +401,7 @@ pub struct App {
     pub skills_dir: PathBuf,
     pub use_alt_screen: bool,
     pub use_mouse_capture: bool,
+    pub use_bracketed_paste: bool,
     #[allow(dead_code)]
     pub system_prompt: Option<SystemPrompt>,
     pub input_history: Vec<String>,
@@ -638,6 +643,7 @@ impl App {
             allow_shell,
             use_alt_screen,
             use_mouse_capture,
+            use_bracketed_paste,
             max_subagents,
             skills_dir: global_skills_dir,
             memory_path: _,
@@ -745,6 +751,7 @@ impl App {
             skills_dir,
             use_alt_screen,
             use_mouse_capture,
+            use_bracketed_paste,
             system_prompt: None,
             input_history: Vec::new(),
             history_index: None,
@@ -1773,6 +1780,7 @@ mod tests {
             allow_shell: yolo,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: PathBuf::from("."),
             memory_path: PathBuf::from("memory.md"),

crates/tui/src/tui/model_picker.rs

@@ -347,6 +347,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: PathBuf::from("."),
             memory_path: PathBuf::from("memory.md"),

crates/tui/src/tui/ui.rs

@@ -124,6 +124,7 @@ const SIDEBAR_VISIBLE_MIN_WIDTH: u16 = 100;
 pub async fn run_tui(config: &Config, options: TuiOptions) -> Result<()> {
     let use_alt_screen = options.use_alt_screen;
     let use_mouse_capture = options.use_mouse_capture;
+    let use_bracketed_paste = options.use_bracketed_paste;
     enable_raw_mode()?;
     let mut stdout = io::stdout();
     if use_alt_screen {
@@ -132,7 +133,9 @@ pub async fn run_tui(config: &Config, options: TuiOptions) -> Result<()> {
     if use_mouse_capture {
         execute!(stdout, EnableMouseCapture)?;
     }
-    execute!(stdout, EnableBracketedPaste)?;
+    if use_bracketed_paste {
+        execute!(stdout, EnableBracketedPaste)?;
+    }
     let backend = CrosstermBackend::new(stdout);
     let mut terminal = Terminal::new(backend)?;
     let event_broker = EventBroker::new();
@@ -295,7 +298,9 @@ pub async fn run_tui(config: &Config, options: TuiOptions) -> Result<()> {
     if use_mouse_capture {
         execute!(terminal.backend_mut(), DisableMouseCapture)?;
     }
-    execute!(terminal.backend_mut(), DisableBracketedPaste)?;
+    if use_bracketed_paste {
+        execute!(terminal.backend_mut(), DisableBracketedPaste)?;
+    }
     terminal.show_cursor()?;
 
     result
@@ -688,13 +693,23 @@ async fn run_event_loop(
                     }
                     EngineEvent::PauseEvents => {
                         if !event_broker.is_paused() {
-                            pause_terminal(terminal, app.use_alt_screen, app.use_mouse_capture)?;
+                            pause_terminal(
+                                terminal,
+                                app.use_alt_screen,
+                                app.use_mouse_capture,
+                                app.use_bracketed_paste,
+                            )?;
                             event_broker.pause_events();
                         }
                     }
                     EngineEvent::ResumeEvents => {
                         if event_broker.is_paused() {
-                            resume_terminal(terminal, app.use_alt_screen, app.use_mouse_capture)?;
+                            resume_terminal(
+                                terminal,
+                                app.use_alt_screen,
+                                app.use_mouse_capture,
+                                app.use_bracketed_paste,
+                            )?;
                             event_broker.resume_events();
                         }
                     }
@@ -3034,6 +3049,7 @@ fn pause_terminal(
     terminal: &mut Terminal<CrosstermBackend<Stdout>>,
     use_alt_screen: bool,
     use_mouse_capture: bool,
+    use_bracketed_paste: bool,
 ) -> Result<()> {
     disable_raw_mode()?;
     if use_alt_screen {
@@ -3042,7 +3058,9 @@ fn pause_terminal(
     if use_mouse_capture {
         execute!(terminal.backend_mut(), DisableMouseCapture)?;
     }
-    execute!(terminal.backend_mut(), DisableBracketedPaste)?;
+    if use_bracketed_paste {
+        execute!(terminal.backend_mut(), DisableBracketedPaste)?;
+    }
     Ok(())
 }
 
@@ -3050,6 +3068,7 @@ fn resume_terminal(
     terminal: &mut Terminal<CrosstermBackend<Stdout>>,
     use_alt_screen: bool,
     use_mouse_capture: bool,
+    use_bracketed_paste: bool,
 ) -> Result<()> {
     enable_raw_mode()?;
     if use_alt_screen {
@@ -3058,7 +3077,9 @@ fn resume_terminal(
     if use_mouse_capture {
         execute!(terminal.backend_mut(), EnableMouseCapture)?;
     }
-    execute!(terminal.backend_mut(), EnableBracketedPaste)?;
+    if use_bracketed_paste {
+        execute!(terminal.backend_mut(), EnableBracketedPaste)?;
+    }
     terminal.clear()?;
     Ok(())
 }

crates/tui/src/tui/ui/tests.rs

@@ -117,6 +117,7 @@ fn create_test_app() -> App {
         allow_shell: false,
         use_alt_screen: true,
         use_mouse_capture: false,
+        use_bracketed_paste: true,
         max_subagents: 1,
         skills_dir: PathBuf::from("."),
         memory_path: PathBuf::from("memory.md"),

crates/tui/src/tui/views/mod.rs

@@ -1521,6 +1521,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: PathBuf::from("."),
             memory_path: PathBuf::from("memory.md"),

crates/tui/src/tui/widgets/footer.rs

@@ -371,6 +371,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: PathBuf::from("."),
             memory_path: PathBuf::from("memory.md"),

crates/tui/src/tui/widgets/mod.rs

@@ -1189,6 +1189,7 @@ mod tests {
             allow_shell: false,
             use_alt_screen: true,
             use_mouse_capture: false,
+            use_bracketed_paste: true,
             max_subagents: 1,
             skills_dir: PathBuf::from("."),
             memory_path: PathBuf::from("memory.md"),