Stellar Depths

0.2.0

• Added an oxygen system. Oxygen depletes in non-breathable dimensions (Space fast, Moon slow) and regenerates in the Overworld. An oxygen bar appears above the hotbar when in a non-breathable dimension, colour-coded blue/orange/red.
• Added progressive suffocation damage. When oxygen hits zero, damage starts infrequent and mild, then accelerates the longer you go without oxygen, mimicking real hypoxia. Grace period before first hit, then escalating urgency.
• LOX Bottle can now be right-clicked to refill oxygen (+40). Consumes the bottle and returns an Empty Bottle.
• Added crafting recipes for LOX Bottle (empty bottle surrounded by packed ice) and Liquid Hydrogen (empty bottle with redstone and iron nuggets). These are temporary; a Cryogenic Condenser block will replace them later.
• Fixed a NullPointerException in the radiation post-effect that fired 20 times per second when the shader was loaded. The blit pass does not have an Intensity uniform; it is now skipped instead of crashing.
• Fixed the radiation shader load retrying every tick with no backoff on GPUs that fail to compile it. A failure flag now stops further retries.