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skills/unsafe-checker/rules/_sections.md

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+# Unsafe Checker - Section Definitions
+
+## Section Overview
+
+| # | Section | Prefix | Level | Count | Impact |
+|---|---------|--------|-------|-------|--------|
+| 1 | General Principles | `general-` | CRITICAL | 3 | Foundational unsafe usage guidance |
+| 2 | Safety Abstraction | `safety-` | CRITICAL | 11 | Building sound safe APIs |
+| 3 | Raw Pointers | `ptr-` | HIGH | 6 | Pointer manipulation safety |
+| 4 | Union | `union-` | HIGH | 2 | Union type safety |
+| 5 | Memory Layout | `mem-` | HIGH | 6 | Data representation correctness |
+| 6 | FFI | `ffi-` | CRITICAL | 18 | C interoperability safety |
+| 7 | I/O Safety | `io-` | MEDIUM | 1 | Handle/resource safety |
+
+## Section Details
+
+### 1. General Principles (`general-`)
+
+**Focus**: When and why to use unsafe
+
+- P.UNS.01: Don't abuse unsafe to escape borrow checker
+- P.UNS.02: Don't use unsafe blindly for performance
+- G.UNS.01: Don't create aliases for "unsafe" named items
+
+### 2. Safety Abstraction (`safety-`)
+
+**Focus**: Building sound safe abstractions over unsafe code
+
+Key invariants:
+- Panic safety
+- Memory initialization
+- Send/Sync correctness
+- API soundness
+
+### 3. Raw Pointers (`ptr-`)
+
+**Focus**: Safe pointer manipulation patterns
+
+- Aliasing rules
+- Alignment requirements
+- Null/dangling prevention
+- Type casting
+
+### 4. Union (`union-`)
+
+**Focus**: Safe union usage (primarily for C interop)
+
+- Initialization rules
+- Lifetime considerations
+- Type punning dangers
+
+### 5. Memory Layout (`mem-`)
+
+**Focus**: Correct data representation
+
+- `#[repr(C)]` usage
+- Alignment and padding
+- Uninitialized memory
+- Cross-process memory
+
+### 6. FFI (`ffi-`)
+
+**Focus**: Safe C interoperability
+
+Subcategories:
+- String handling (CString, CStr)
+- Type compatibility
+- Error handling across FFI
+- Thread safety
+- Resource management
+
+### 7. I/O Safety (`io-`)
+
+**Focus**: Handle and resource ownership
+
+- Raw file descriptor safety
+- Handle validity guarantees