v0.4.1

Release v0.4.1

Features

• Terminal text selection and copy: Select text in the container window by
  clicking and dragging the mouse. The selected region is highlighted with
  inverted colours. Press Ctrl+Y to copy the selection to the system
  clipboard as plain text (ANSI colour codes are stripped). Ctrl+Y with no
  active selection forwards the key to the agent as normal. Selection is
  automatically cleared on Esc, terminal resize, or when a new container
  session starts.

• Expanded scrollback history (10,000 lines): The container terminal now
  retains up to 10,000 lines of scrollback history by default (up from the
  previous ~50-line effective limit). The scroll speed increases to 5 lines per
  mouse-wheel tick. The scrollback indicator in the title bar now shows
  ↑ scrollback (N / M lines) — the current offset N and the total depth M
  — so you can see at a glance how far back you have scrolled and how much
  history is available.

• Configurable scrollback line count: The scrollback capacity can be tuned
  per-repository or globally via a new terminal_scrollback_lines config field.
  Per-repo config takes precedence over global config; both fall back to the
  built-in default of 10,000 lines. Reduce this value to lower memory usage
  when running many tabs; increase it for very long build or test runs.

  Per-repo (GITROOT/.amux/config.json):

  { "terminal_scrollback_lines": 5000 }

  Global ($HOME/.amux/config.json):

  { "terminal_scrollback_lines": 20000 }

Improvements

• Scrollback depth probe: The scroll handler now probes the actual number of
  retained scrollback rows (via a set_scrollback(usize::MAX) sentinel) instead
  of capping at the visible screen height. This was the root cause of the
  previous ~50-line limit — the parser held 1,000 rows but the scroll offset was
  incorrectly bounded to the ~24-row screen size.

• Clipboard abstraction for CI: The clipboard write path is abstracted
  behind a ClipboardWriter trait, making the copy flow testable without a real
  display server. In headless environments (no X11/Wayland), clipboard
  initialisation fails gracefully with a log warning instead of a panic.

Fixes

• Fixed the container terminal scrollback being limited to approximately one
  screen height regardless of how much history was stored in the parser.