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.

02_boot_sequence/README.md

@@ -0,0 +1,12 @@
+[← Home](../README.md)
+
+# Boot Sequence — Overview
+
+## Section Index
+
+| File | Description |
+|---|---|
+| [cold_boot.md](cold_boot.md) | Power-on to Kickstart: hardware init, ROM checksum |
+| [kickstart_init.md](kickstart_init.md) | ROM scan, resident modules, ExecBase creation |
+| [dos_boot.md](dos_boot.md) | BootStrap, eb_MountList, startup-sequence |
+| [early_startup.md](early_startup.md) | Early Startup Control (ESC menu), boot priority |