Propagate the submitted job id through simple-mode share handling so accepted shares can be flagged expired when a reply lands after a job rollover. Add coverage for the expired accept event path.\n\nCo-Authored-By: Virgil <virgil@lethean.io>
Stratum mining proxy library skeleton with 18 Go source files, type
declarations, event bus, NiceHash/simple splitter packages, pool client,
HTTP API types, access/share logging, and rate limiter. No function
implementations — ready for agent dispatch.
Co-Authored-By: Virgil <virgil@lethean.io>