Goop 1.1.1

Tests and examples overhaul: prune stale demos, strengthen e2e coverage, fix select channel lowering.

Highlights

Examples: Removed overlapping demos (chan_async, channel_race, linear, match_patterns, simple_hl_bot, trading_position); fixed concurrency.goop (go + send + recv); added modules.goop and exceptions.goop
Tests: Dropped non-CI Binance demo and duplicate refinement test; renamed misleading async/guards/newtype test files; real asserts for FCM, synthetic TA, list/array helpers
Coverage: select_test, chan_close_test, effect_multi_test, exception_payload_test; Go unit tests for perform-in-go and LINEAR008 race fixtures
Compiler: select lowers through C0Chan.ch with element type assertions; checkPerformInGo walks ParenExpr