fix(dashboard): use os._exit on quit so bottles survive the dashboard

The `bottles` dict held `@contextmanager`-wrapped launch contexts.
On normal Python interpreter shutdown those context managers'
generators got GC'd, which raised GeneratorExit at the yield
point and ran the `finally` block — invoking each bottle's
teardown and tearing down the compose project. Net effect: `q`
WAS implicitly stopping every dashboard-launched bottle even
though the keypress handler just `return`'d.

`os._exit(0)` skips all Python-level cleanup (GC, atexit, etc.),
so the docker compose projects survive the dashboard exit
untouched. Curses gets explicit `endwin()` first because the
brutal exit skips curses.wrapper's normal terminal restoration.

Matches PRD 0020's resolved-question answer (`q` does NOT tear
down bottles; teardown is always explicit via `x` or
`./cli.py cleanup`).

claude_bottle/cli/dashboard.py

@@ -820,6 +820,30 @@ def _try_init_green() -> int:
         return 0
 
 
+def _quit_without_teardown(bottles: dict) -> None:
+    """Exit the dashboard process WITHOUT triggering Python's normal
+    cleanup of the `bottles` dict's context managers.
+
+    The dict holds `@contextmanager`-decorated objects whose
+    underlying generators have implicit close-on-GC behavior:
+    when Python's interpreter shutdown collects them, each
+    generator's `finally` block runs, which invokes that bottle's
+    teardown (`docker compose down`). PRD 0020 explicitly DOESN'T
+    want that — quitting the dashboard should leave running
+    bottles running. `os._exit` skips all Python-level cleanup
+    (GC, atexit, stdio flush, etc.), so the docker compose
+    projects survive the dashboard exit untouched.
+
+    The `bottles` arg is accepted for the explicit
+    documentation-of-intent — we're choosing not to close
+    these. Curses gets its terminal restored via the explicit
+    `endwin` below since `os._exit` doesn't run
+    curses.wrapper's finally."""
+    del bottles  # nothing to do with it; the os._exit is the point
+    curses.endwin()
+    os._exit(0)
+
+
 # PRD 0019 chunk 3: which pane the j/k/arrow keys move through.
 # Tab toggles. The proposals pane is the default focus — proposal
 # action keys (a/m/r/Enter) require it; agent-scoped keys (e/p,
@@ -900,7 +924,8 @@ def _main_loop(stdscr: "curses._CursesWindow") -> None:
         status_line = ""
 
         if key in (ord("q"), 27):  # q or ESC
-            return
+            _quit_without_teardown(bottles)
+            return  # unreachable; _quit_without_teardown os._exit's
         if key == 9:  # Tab
             focus = PANE_AGENTS if focus == PANE_PROPOSALS else PANE_PROPOSALS
             continue