refactor(ui): PR #134 review — MetaScreen/ESC chain tightening, D-192 reword

Addresses Tyre's 9 architecture items from the sprint-36 client review.

- decisions/architecture.md (Tyre #1): D-192 now says "deprecate; removal
  tracked in #868" instead of "remove". The branch does not remove the
  version field or guard — that belongs in the coordinated server+client
  PR. The decision text now matches the code on this branch.
- meta_stack.gd (#2): handle_escape() on a screen with
  closable_by_escape=false now consumes the event unconditionally. Was
  returning whatever on_escape() returned, which default-returned false
  and leaked ESC into main.gd's implant/settings chain — opening the
  settings dialog behind the loading screen.
- debug_console.gd (#4): drop the direct KEY_ESCAPE branch in
  _unhandled_input. ESC now falls through to main.gd → MetaStack, which
  finds the console on top of the stack and closes it via the normal
  path. Other keys are still consumed so movement/action can't leak.
- main.gd (#6, #10): extract the ESC priority chain into
  _handle_menu_key() so "MetaStack → implant → settings" is a named
  thing. Add a comment near connect_to_sim explaining that
  GameState.bookmark_catalog survives the Option A scene transition via
  the autoload.
- main_menu.gd (#7): header comment documenting the double LoadingScreen
  lifecycle — safe today because main_menu.tscn and main.tscn never
  co-exist, noted for future promotion to autoload if that changes.
- meta_screen.gd (#8): apply captures_input symmetrically in open()/
  close() — was set in open() only, so a screen changing the flag
  between open+close kept the opened value forever.
- meta_screen.gd (#9): on_escape() docstring clarifies the tri-state
  (consume-and-hold / consume-and-close / ignore) — and that
  closable_by_escape=false is the screen-wide way to say
  "consume-and-hold".
- bug_report_dialog.gd (#11): capture_cancelled now emits from
  on_close() (covers any close path — ESC, MetaStack pop, programmatic
  close) rather than only on_escape(). A new _completed flag
  distinguishes completion from cancel so the two signals stay
  mutually exclusive.

client/ui/meta/screens/debug_console/debug_console.gd

@@ -108,10 +108,11 @@ func _unhandled_input(event: InputEvent) -> void:
 		_toggle()
 		return
 	if is_open():
-		# Consume all keyboard events — prevent movement/action leaking through
-		get_viewport().set_input_as_handled()
-		if event.keycode == KEY_ESCAPE:
-			close()
+		# Consume keyboard events so movement/action don't leak to main.gd,
+		# but let ESC fall through to OPEN_MENU → MetaStack.handle_escape().
+		# MetaStack finds this console at the top of the stack and closes it.
+		if event.keycode != KEY_ESCAPE:
+			get_viewport().set_input_as_handled()
 
 
 func _on_input_key(event: InputEvent) -> void: