v0.3.7

Changelog

• 3bce332 feat: add Fable 5.1 and Mythos 5.1 pricing, geo multiplier, and iteration folding
• 4143e2c feat: add Opus 5 pricing, plus pricing-path fixes and CI hardening
• 5c085f5 feat: add worktree statusline segment (#6)
• c42d893 fix: correct Sonnet 5 and withdrawn fast-mode pricing