docs: update ROADMAP and LanguageRef with closures

- Mark capture-less closures as ✅ Done in ROADMAP
- Add closure syntax examples to LanguageRef.md Functions section
- Update PHASE8_STRATEGY.md Milestone A with closures

docs/LanguageRef.md

@@ -184,6 +184,14 @@ func Vec2_operator_eq(self: *Vec2, other: Vec2) -> bool { ... }
 func Vec2_operator_lt(self: *Vec2, other: Vec2) -> bool { ... }
 func MyArray_operator_index_get(self: *MyArray, idx: int) -> int { ... }
 func MyArray_operator_index_set(self: *MyArray, idx: int, value: int) { ... }
+
+// Closures (capture-less for now)
+let add: func(int, int) -> int = |a: int, b: int| -> int { return a + b; };
+let sum: int = add(3, 4);  // 7
+
+// Closure passed to higher-order function
+func Apply(x: int, op: func(int) -> int) -> int { return op(x); }
+let doubled: int = Apply(5, |x: int| -> int { return x * 2; });  // 10
 ```
 
 ---

docs/PHASE8_STRATEGY.md

@@ -294,6 +294,7 @@ Crates.io е непреодолимо предимство. Ние се конк
 - ✅ defer, switch/case, operator overloading — готово
 - ✅ `bux new`, `bux init`, `bux test`, `bux fmt` — готово
 - ✅ Basic borrow checker (`@[Checked]`) — готово
+- ✅ Closures (capture-less anonymous functions) — готово
 - 🎯 Target: Можеш да напишеш `bux` package manager на Bux
 
 ### Milestone B: "Използваем за systems programming" (2 месеца)

docs/ROADMAP.md

@@ -236,6 +236,7 @@ Task::Spawn(Worker, rx);
 5. ✅ **Named/default parameters** — Done
 6. ✅ **Basic borrow checker (`@[Checked]`)** — Done (selfhost)
 7. ✅ **`bux fmt`, `bux test`, `bux new`, `bux init`** — Done (selfhost)
-8. **Closures** — High complexity, unlocks iterators and functional style. **← NEXT**
-9. **`for x in collection`** — Depends on closures or trait system.
-10. **Destructors / Drop** — High complexity, needs ownership + move semantics.
+8. ✅ **Closures (capture-less)** — Done. Enables callbacks and higher-order functions.
+9. **Closures with captures** — Needs capture analysis + environment struct. **← NEXT**
+10. **`for x in collection`** — Depends on closures with captures or trait system.
+11. **Destructors / Drop** — High complexity, needs ownership + move semantics.