Update model card with full architecture and training details

Upload pruned Aetheris (536M params, 80K vocab, 25.7% smaller)

Upload Aetheris model (Stage 2 best, 722M params, loss=2.73)

Stage 2 checkpoint: [Step 18500/20000] loss=3.1250

Stage 2 checkpoint: [Step 16250/20000] loss=3.1719

Stage 2 checkpoint: [Step 14050/20000] loss=3.7812

Stage 2 checkpoint: [Step 13450/20000] loss=3.3594

Stage 2 checkpoint: [Step 12350/20000] loss=3.3750

Stage 2 checkpoint: [Step 10150/20000] loss=3.4375

Stage 2 checkpoint: [Step 8500/20000] loss=3.0625

Stage 2 checkpoint: [Step 7350/20000] loss=3.0469

Stage 2 checkpoint: [Step 6250/20000] loss=4.3750

Stage 2 checkpoint: [Step 5150/20000] loss=4.0312

Stage 2 checkpoint: [Step 4550/20000] loss=3.7031

Stage 2 checkpoint: [Step 4000/20000] loss=4.1250

Stage 2 checkpoint: [Step 3400/20000] loss=3.6719

Stage 2 checkpoint: [Step 2850/20000] loss=4.2500

Stage 2 checkpoint: [Step 1800/20000] loss=5.8750

Stage 2 checkpoint: [Step 1200/20000] loss=6.2812

Stage 2 checkpoint: [Step 650/20000] loss=6.4688

Stage 2 checkpoint: [Step 100/20000] loss=7.5625

Stage 1 checkpoint: [Step 50/20000] loss=7.7500

Stage 1 complete: 10K steps, CKA layer alignment final checkpoint

Stage 1 checkpoint: [Step 9100/10000] loss=0.0141 cka_mean=0.1489

Stage 1 checkpoint: [Step 8400/10000] loss=0.0131 cka_mean=0.1052

Stage 1 checkpoint: [Step 7100/10000] loss=0.0161 cka_mean=0.1370

Stage 1 checkpoint: [Step 6400/10000] loss=0.0199 cka_mean=0.3752

Stage 1 checkpoint: [Step 5050/10000] loss=0.0500 cka_mean=0.4527

Stage 1 checkpoint: [Step 4400/10000] loss=0.6573 cka_mean=0.3674

docs: comprehensive model card with Space link and benchmarks

Stage 1 checkpoint: [Step 3100/10000] loss=0.0432 cka_mean=0.4536

Stage 1 checkpoint: [Step 2450/10000] loss=0.0617 cka_mean=0.4075

Stage 1 checkpoint: [Step 1800/10000] loss=0.1092 cka_mean=0.4199

Stage 1: step 1000+, loss dropping, cka=0.60

Stage 1 initial: step 1000, loss=0.29, cka=0.60