docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections

Comprehensive technical documentation covering:
- Hardware: OCS/ECS/AGA custom chip registers, Copper & Blitter deep dives
- Boot sequence: cold boot through startup-sequence
- Binary format: HUNK executable spec, relocation, debug info
- Linking & ABI: .fd files, LVO tables, register calling conventions
- Exec kernel: tasks, interrupts, memory, signals, semaphores
- AmigaDOS: file I/O, FFS/OFS layout, CLI/Shell scripting
- Graphics: planar bitmaps, Copper programming, HAM/EHB modes
- Intuition: screens, windows, IDCMP, BOOPSI
- Devices: trackdisk, SCSI, serial, timer, audio, keyboard
- Libraries: utility, expansion, IFFParse, locale, ARexx
- Networking: bsdsocket API, SANA-II, TCP/IP stack comparison
- Toolchain: GCC, vasm/vlink, SAS/C, NDK, debugging
- Reverse engineering: IDA/Ghidra setup, compiler fingerprints, case studies
- CPU & MMU: 68040/060 emulation libs, PMMU, cache management
- Driver development: SANA-II, Picasso96/RTG, AHI audio

All files include breadcrumb navigation. No local paths or proprietary content.

11_libraries/layers.md

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+[← Home](../README.md) · [Libraries](README.md)
+
+# layers.library — Window Clipping Layers
+
+## Overview
+
+`layers.library` provides the clipping and damage-repair infrastructure that Intuition windows are built on. Each window's `RastPort` is backed by a `Layer` that manages overlapping regions.
+
+---
+
+## Layer Types
+
+| Flag | Type | Description |
+|---|---|---|
+| `LAYERSIMPLE` | Simple Refresh | Application must redraw damaged areas |
+| `LAYERSMART` | Smart Refresh | System saves obscured regions |
+| `LAYERSUPER` | Super BitMap | Application provides full-size bitmap |
+| `LAYERBACKDROP` | Backdrop | Behind all other layers |
+
+---
+
+## Key Functions
+
+```c
+struct Layer_Info *li = NewLayerInfo();
+
+struct Layer *layer = CreateUpfrontLayer(li, bitmap,
+    x1, y1, x2, y2, LAYERSMART, NULL);
+
+/* Lock before drawing: */
+LockLayer(0, layer);
+/* ... draw into layer->rp ... */
+UnlockLayer(layer);
+
+/* Move: */
+MoveLayer(0, layer, dx, dy);
+
+/* Resize: */
+SizeLayer(0, layer, dw, dh);
+
+/* Cleanup: */
+DeleteLayer(0, layer);
+DisposeLayerInfo(li);
+```
+
+---
+
+## References
+
+- NDK39: `graphics/layers.h`, `graphics/clip.h`