feat: operator overloading in bootstrap compiler

- Add operatorMethodName mapping (tkPlus -> operator_add, etc.)
- Add tryLowerOperatorCall / tryLowerIndexCall in HIR lowerer
- Modify ekBinary lowering to check method table before builtins
- Modify ekAssign lowering to detect ekIndex target and emit
  operator_index_set method call when available
- Add sema type-checking for operator overloads in ekBinary
  and ekIndex paths (method-table lookup before builtin rules)
- Fix sema compile errors: minfo.params[N].typ -> minfo.params[N]
- Fix hir_lower forward decl ordering for resolveExprType
- Update golden test expected.c files for current C backend
- Update ROADMAP.md and PHASE8_STRATEGY.md status

docs/PHASE8_STRATEGY.md

@@ -1,6 +1,7 @@
 # Фаза 8 — Стратегия: Как Bux печели, без да бие пряко Rust/Nim/Zig
 
-> **Дата:** 2026-05-31 | **Статус:** Фаза 8.1 ✅, 8.2-8.6 🔄
+> **Дата:** 2026-06-08 | **Статус:** Фаза 8.1 ✅, 8.2-8.6 🔄
+> **Последни постижения:** defer ✅, switch/case ✅, operator overloading ✅, selfhost-loop deterministic ✅
 > **Правило #1:** Не се биеш с някого там, където той е най-силен.
 
 ---
@@ -285,10 +286,12 @@ Crates.io е непреодолимо предимство. Ние се конк
 
 ## 6. Пътна карта за победа (реалистична)
 
-### Milestone A: "Използваем за CLI tools" (2-3 седмици)
+### Milestone A: "Използваем за CLI tools" ✅ ЗАВЪРШЕН
 - ✅ Generics, Result/Option, pattern matching — готово
-- 🔄 Fix `buxc2` bootstrap loop (14/14 modules)
-- 🔄 File I/O, path ops, process spawn в stdlib
+- ✅ Fix `buxc2` bootstrap loop (14/14 модула)
+- ✅ Selfhost-loop deterministic (C output identical)
+- ✅ File I/O, path ops, process spawn в stdlib
+- ✅ defer, switch/case, operator overloading — готово
 - 🎯 Target: Можеш да напишеш `bux` package manager на Bux
 
 ### Milestone B: "Използваем за systems programming" (2 месеца)