hunyuan2-plus v0.1.0

• docs: add per-version CHANGELOG (4d2e4e8)
• fix: corrected Hermite sign convention (x = +k) from hicache-pp 1.2.0, mini A/B banked (8ba84b7)
• docs: drop unreleased dit-plus row from the family matrix (0a74762)
• docs: standardize family README (hub link, method naming, attribution) (7bc4ce1)
• chore: remove unused square logo (banner is the only displayed image) (91e66e4)
• docs: badge row — real upstream + arXiv links, drop vanity (90849f6)
• docs: add logo + landscape banner to README header (753df73)
• docs(readme): add 'when to use' positioning matrix (ed8d9dd)
• docs: add Citation section (base model + acceleration methods) (31fdc4c)
• Initial release: hunyuan2+ — HiCache on Hunyuan3D-2 mini (57c60a3)