fix(tests): PR #134 review round 3 — seed start-state + PID log path

- test_character_creation_sprint28: before_each now seeds
  _selected_bookmark_id and _selected_location_id so the new disabled-
  guard in _on_start() (round 2) doesn't silently block 5 existing
  tests that call _on_start()/KEY_ENTER without setting up a valid
  bookmark selection. Restores the 2 tests Hoshe flagged as R2-H1 plus
  3 siblings that would have degraded the same way under the guard.
- tests/run-godot: LOG_FILE now includes $$ (PID) so concurrent runs
  across worktrees don't clobber each other's logs. Path is echoed
  back via the stdout JSON "log" field and the stderr hint line, so
  callers never need to predict it (R2-H2).

client/tests/test_character_creation_sprint28.gd

@@ -26,6 +26,13 @@ func before_each() -> void:
 		return
 	_scene = packed.instantiate() as CharacterCreation
 	add_child(_scene)
+	# Seed a valid bookmark/location so _on_start passes the disabled guard
+	# added in PR #134 (R2-Hoshe-1). Tests that verify the disabled state
+	# should explicitly clear these and call _update_start_btn_state().
+	_scene._selected_bookmark_id = "test-bookmark"
+	_scene._selected_location_id = "test-location"
+	if _scene.has_method("_update_start_btn_state"):
+		_scene._update_start_btn_state()
 
 
 func after_each() -> void: