feat(awareness): render the Global Context compass from a store

The awareness layer presents the compass ring, heading, cardinal labels and
contact bearing markers through subscribeDirectionOverlay(); the application
shell publishes them to the gev-awareness-direction store and the scene
chrome renders them in the viewer's container.

docs/APPLICATION.md

@@ -211,8 +211,8 @@ out `scene-chrome` the before/after imagery dividers (the imagery still splits,
 with no line or handle to move it), the status chips, the toast, the ORBIT
 indicator, the FPS readout, the Scene actions panel, the data-pack attribution
 cards, the wind inspection marker, the Space Missions replay vehicle, the
-full-globe celestial ring, the screen-space map annotations and the
-visible map target list;
+full-globe celestial ring, the screen-space map annotations, the visible
+map target list and the Global Context compass;
 leaving out `command-dock` the voice control and its pointer reticle; and
 leaving out `context` the Bhote Koshi reconstruction panel. An unknown
 view name is an error. A host that does not initialize Core's locale passes