agentydragon(tasks): add task 30 non-fullscreen scrollback mode

agentydragon/tasks/30-non-fullscreen-scrollback-mode.md

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+---
+id: 30
+title: Non-Fullscreen Scrollback Mode with Native Terminal Scroll
+status: Not started  # one of: Not started, Started, Needs manual review, Done, Cancelled
+summary: Offer a non-fullscreen TUI mode that appends conversation output and defers scrolling to the terminal scrollback.
+goal: |
+  Provide an optional non-fullscreen mode for the chat UI where:
+  - The TUI does not capture the mouse scroll wheel.
+  - All conversation output is appended in place, allowing the terminal's native scrollback to navigate history.
+  - The user-entry window remains fixed at the bottom of the terminal.
+  - The entire UI runs in a standard terminal buffer (no alternate screen), so the user can use their terminal’s scrollbar or scrollback keys to review past messages.
+
+## Acceptance Criteria
+
+- Introduce a `tui.non_fullscreen_mode` config flag (default `false`).
+- When enabled, the application:
+  - Disables alternate screen buffering (i.e. does not switch to the TUI alt-screen).
+  - Does not intercept mouse scroll events; scroll events are passed through to the terminal.
+  - Renders new chat messages inline (appended) rather than redrawing the full viewport.
+  - Keeps the user input prompt visible at the bottom after each message.
+- Add integration tests or manual validation steps to confirm that: scrollback keys/mouse scroll work via terminal scrollback, and the prompt remains in view.
+
+## Implementation
+
+**How it was implemented**  
+- Add `non_fullscreen_mode: bool` to the `tui` config section.
+- In the TUI initialization, skip entering the alternate screen and disable pannable viewports.
+- Remove mouse event capture for scroll wheel events when `non_fullscreen_mode` is true.
+- Change rendering loop: after each new message, print the message directly to the stdout buffer (in append mode), then redraw only the input prompt line.
+- Write integration tests that spawn the TUI in non-fullscreen mode, emit multiple messages, send scroll events (if possible), and assert that scrollback buffer contains the messages.
+
+## Notes
+
+- This mode trades advanced in-TUI scrolling features for simplicity and compatibility with users’ accustomed terminal scrollback.
+- It may not support complex viewport resizing; documentation should note that.