Reorganize source tree: kernel/, v3/, v4/ split and board infrastructure

Source tree reorganization:
- Move StarForth v3 engine to v3/ (src/, include/, Makefile)
- Move kernel to kernel/ (src/, include/, linker/, Makefile)
- Create v4/ skeleton for F18-ISA golden model (DECOMPOSITION.md, JUSTIFICATION.md)
- Move FABRIC-0..4.md to docs/fabric/
- Move ONTOLOGY.md and ROADMAP.md to docs/

Board infrastructure:
- Add boards/ser5/, boards/raspi/, boards/milkv/, boards/zynq7020/
- Each board has board.mk (ISA, CPU flags, boot recipe) and README.md
- Root Makefile becomes thin dispatcher: boot_image, all, clean, docs take TARGET
- make boot_image TARGET=SER5|RASPI|MILKV builds one GPT/MBR image per board
- ZYNQ7020 target exists but stops with clear error (ARMv7 port not built yet)
- scripts/mkdiskimage.sh builds disk images for all boards

Docs pipeline:
- docs/book/ with LaTeX master (main.tex) and Makefile
- pandoc converts Markdown to LaTeX at build time
- Two Lua filters: table-widths.lua (wide tables wrap), code-breaks.lua (inline code breaks)
- make docs builds single PDF (754 pages, 0 missing characters)
- make docs TARGET=<board> adds board appendix
- build/docs/<book|board>/meta.tex stamps git commit into PDF

Bug fixes:
- 42 include paths that only worked by accident now use correct relative paths
- clang-18 hardcode replaced with configurable CC variable (fixed aarch64 build)
- Pi 5: kernel_2712.img linked at 0x80000, .bss zeroed, memory reserved
- Doxyfile, .clang-tidy, README.md, Kconfig paths updated

Verified:
- Hosted v3 build passes 1012 tests, 0 failures
- SER5 image boots in QEMU (OVMF), POST passes, K exact (65536 = Q48_ONE)
- Milk-V image boots in QEMU (OpenSBI + U-Boot + bootefi), POST passes
- make clean TARGET=<board> removes only that board and its ISA objects
- make all builds all boards, hosted v3, and docs in one run

Co-authored-by: Junie <junie@jetbrains.com>

README.md

@@ -48,19 +48,39 @@ POST at boot: **parity hash verified across amd64/aarch64/riscv64 · Mama capsul
 ## Quick Start
 
 ```bash
+# One boot image per physical target (output: build/boards/<board>/)
+make boot_image TARGET=SER5       # Beelink SER5   -- GPT/ESP, BOOTX64.EFI
+make boot_image TARGET=RASPI      # Raspberry Pi 5 -- FAT, config.txt + kernel_2712.img + DTB
+make boot_image TARGET=MILKV      # Milk-V Mars    -- GPT/ESP, BOOTRISCV64.EFI (U-Boot bootefi)
+make boot_image TARGET=ZYNQ7020   # Zynq-7020      -- ARMv7 port in progress
+make boards                       # list boards
+
+# The same TARGET drives all, docs and clean (make help)
+make                              # every board with a kernel port + hosted v3 + the book
+make TARGET=RASPI                 # one board's image + build/docs/LithosAnanke-raspi.pdf
+make docs                         # build/docs/LithosAnanke.pdf (LaTeX master: docs/book/main.tex)
+make clean TARGET=RASPI           # that board's outputs and build/aarch64/kernel
+make clean                        # all of build/ except build/cache/
+
 # Build kernel (requires cross-compilation toolchain, or native gcc)
-make -f Makefile.starkernel ARCH=amd64
+make -f kernel/Makefile ARCH=amd64
 
 # Run in QEMU with OVMF
-make -f Makefile.starkernel qemu
+make -f kernel/Makefile qemu
 
 # Other architectures
-make -f Makefile.starkernel ARCH=aarch64 qemu
-make -f Makefile.starkernel ARCH=riscv64 qemu
+make -f kernel/Makefile ARCH=aarch64 qemu
+make -f kernel/Makefile ARCH=riscv64 qemu
 ```
 
 Artifacts: `build/amd64/kernel/starkernel_loader.efi` · `build/amd64/kernel/starkernel_kernel.elf`
 
+Tree: `kernel/` (LithosAnanke: `Makefile`, `src/`, `include/starkernel/`, `linker/`),
+`v3/` (StarForth v3 engine and hosted build: `Makefile`, `src/`, `include/`),
+`v4/` (StarForth v4, see `docs/v4.0.0/`), `boards/<board>/` (`board.mk` + boot files).
+Every makefile runs from the repo root; the root `Makefile` forwards any other goal to
+`v3/Makefile` (hosted build).
+
 For the hosted VM by itself (Linux, no cross-compiler needed, no bare-metal tooling): see
 the separate **StarForth** repository — LithosAnanke used to be a branch inside that repo,
 now it's its own project with its own `master`.
@@ -69,12 +89,12 @@ now it's its own project with its own `master`.
 
 Every kernel-only knob (`STARFORTH_ENABLE_VM`, `PARITY_MODE`, the shared
 physics/heartbeat family, etc.) is an optional Kconfig symbol — a plain
-`make -f Makefile.starkernel` uses the same defaults it always has unless
+`make -f kernel/Makefile` uses the same defaults it always has unless
 you opt in:
 
 ```bash
-make -f Makefile.starkernel ARCH=amd64 menuconfig
-make -f Makefile.starkernel ARCH=amd64 kernel_amd64_defconfig
+make -f kernel/Makefile ARCH=amd64 menuconfig
+make -f kernel/Makefile ARCH=amd64 kernel_amd64_defconfig
 ```
 
 ---