feat(phase285w): Phase 285W-Syntax-0.1 - Reject weak(...) syntax (Parser-level Fail-Fast)

- Parser guard: Reject weak(...) with LPAREN check in parse_unary()
  - Error: "Use 'weak expr', not 'weak(expr)'" (helpful message)
  - Location: src/parser/expressions.rs:248-256
- MIR builder guard: Defense-in-depth for any bypassed cases
  - Location: src/mir/builder/calls/build.rs:37-46
- Rejection test: apps/tests/phase285w_weak_call_rejected.hako
- Smoke test: phase285w_weak_call_rejected_vm.sh (PASS ✅)
- Documentation:
  - EBNF.md: Add ~ (BitNot) to unary operators
  - lifecycle.md: Document weak(expr) as invalid syntax
  - phase-285/README.md: Add Phase 285W-Syntax-0.1 entry

Test results: 5/6 phase285 tests PASS (1 unrelated failure)
SSOT: docs/reference/language/lifecycle.md

Closes: Phase 285W-Syntax-0.1

docs/development/current/main/phases/phase-285/README.md

@@ -11,9 +11,11 @@ Status: In progress (A1 series implemented; LLVM sub-phases ongoing)
 | 285LLVM-1.3 | ✅ COMPLETE | InstanceBox Field Access (getField/setField) (2025-12-24) |
 | **285LLVM-1.4** | ✅ **COMPLETE** | **print Handle Resolution (型タグ伝播)** (2025-12-24) |
 | **285W-Syntax-0** | ✅ **COMPLETE** | **weak文法SSOT確定 (weak x unary operator)** (2025-12-24) |
+| **285W-Syntax-0.1** | ✅ **COMPLETE** | **weak(x) 完全拒否 (Parser-level Fail-Fast)** (2025-12-24) |
 
 **LLVM Details**: See [phase-285llvm-1.3-verification-report.md](phase-285llvm-1.3-verification-report.md)
 **Syntax Change**: Phase 285W-Syntax-0 migrates from `weak(x)` function call to `weak x` unary operator
+**Syntax Enforcement**: Phase 285W-Syntax-0.1 enforces parser-level rejection of `weak(...)` syntax with helpful error message
 
 ---