Release v0.1.2

[toreleon]

Summary

• Expand stock discovery beyond fixed index-style lists with listed-equity, exchange, preset, and custom ticker universes.
• Default /backtest to the previous calendar week and replay strategy turns at a configurable interval cadence.
• Prepare v0.1.2 release notes and allow release automation to run from release/** branches or manual dispatch.

Validation

• pnpm typecheck
• pnpm test -- tests/tui.test.tsx
• pnpm build
• npm pack --dry-run