Fairy Lights 8.0.16 - Pennant attach + save hang

Pennant Bunting

• Flags hung ~1 block below the rope (CF report, reproduced meka_test 07.22.32).
• 8.0.8 applied the model fixed translation [-7.5, -16, -8] by hand and renderBakedModel still applies ItemDisplayContext.FIXED. Doubled offset.
• Renderer now lets FIXED apply once.

World leave hang

• Save/quit stuck at Saving worlds (07:22:36, no Saving chunks). setRemoved / fence entity unload called fastener.remove(), which dest.gets the other end under CONNECTION_MAP_LOCK.
• Unload now detachLocal() (clear maps, no peer lookup). Intentional break still dropItems + remove() from FastenerBlock.onRemove / fence KILLED.