docs: v0.55 — wiki warmup complete, checkpoint deprecation notice

restore: README to v0.5-alpha model card

Revert to v0.1-alpha baseline and withdraw v0.5-alpha

docs: corrected quickstart + v0.5-alpha maturity note

docs: restore full model card (pipeline overwrote README)

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docs: correct architecture name to RtaSSM v7.2.2-FU Fortress Unbroken

docs: add Why SSM? explainer box

model card: Anvaya-Rabbit 2.7B v0.5-alpha

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docs: link executive briefing PDF in model card

docs: improved model card with training narrative and polaris-revival link

docs: correct training curriculum (6-phase 1500-step sprint), wall-clock ~7 days, Raccoon 6.1B

fix: consistent 2.7B naming, reviewer fixes, rtaforge-substrates note

full model card rewrite — Rabbit v0.1 Alpha

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docs: reframe as PoC, add step-1500 internal evals, honest lm-eval disclaimer

model card: CC-BY-NC-SA 4.0, lineage, dataset curriculum, base/imprint structure