v0.24.3

Fixed

• Schwab adapter: login no longer reaches into private _account_hash. The class now exposes a stable public account_hash attribute (used for token-file reuse). Login flow + test mocks updated.
• Paper broker: removed dead raise BrokerError signalling code in reset() (never reached by the CLI and would incorrectly raise on some explicit-starting-cash calls). reset() now cleanly succeeds.
• Paper login UX: when running msts-trader login --broker paper against an existing book, the entered starting cash is now clearly noted as applying only to brand-new state files (with hint to use paper-reset).

Improved

• Market hours: holiday + early-close calendars extended through 2028 using official NYSE dates. New Year 2028 (falls on Saturday) correctly has no observed trading holiday. Comment + README updated.
• Development: added ruff format example + [tool.ruff.format] config. Main source package (msts_trader/) is now consistently formatted.
• Ruff format run on the library source (24 files) as part of release hygiene.

What's Changed

• fix(stops): reconcile protective stops on no-trade and duplicate days by @markudevelop in #8
• fix: NYSE half-day early closes + atomic/locked runstate writes by @markudevelop in #9

Full Changelog: v0.24.2...v0.24.3