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boot.sh: replace esp/ + DISK_IMG with single SYSTEM_IMG on ide.0
(hooks into mksystem.sh --force for auto-staging).
boot-image.sh: delegate to mksystem.sh --chain (build-image.sh deleted).
build-image-release.sh: delegate to mksystem.sh --chain --gpt.
qemu.sh: flexible launcher uses SYSTEM_IMG; --chain flag for
full-chain build.
test-disk.sh: drop ESP_DIR (mksystem.sh stages everything).
test-fault.sh: boot system.img on ide.0 + CRASHLOG stick on ide.1;
replace deleted mkdisk.sh with inline mkfs.fat.
test-gfx.sh: system.img on ide.0, stage via mksystem.sh.
test-mouse.sh: system.img on ide.0, stage via mksystem.sh.
test-msg.sh: system.img on ide.0, stage via mksystem.sh.
Makefile: remove stale build-image.sh/mkdisk.sh references from help;
image target delegates to mksystem.sh --chain.
All scripts syntax-checked (bash -n). build-image.sh and mkdisk.sh
no longer referenced anywhere.
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User's machine: boot reached 'rsnix: boot done — shell' then panicked
'len is 0, index 0' at the first cell write — CELLS (the vt grid) was
valid at vt::init and empty at the first shell paint, i.e. something
stomped the heap between vt::init and the shell banner. The only
change in that window vs the working v0.5.3 was the v0.5.4 move of the
1.9 MB display shadow from the heap to the fb-aware page allocator:
on this machine's memory layout the page-allocator shadow's fill loop
(480K words) clobbered the heap's vt vectors.
- Shadow is again the *first* heap allocation, in gop::init before
vt::init builds its grids (the v0.5.3 layout that provably boots on
the user's hardware) — nothing else in the heap can collide with it.
- init_heap now splits the free list at the GOP framebuffer hole
instead of subtracting its size from one block that still *spanned*
the hole — no heap allocation of any size can land on the display.
- Kept the panic-proof try_reserve + fb-overlap rejection + no-shadow
warning band; dropped the late init_shadow() call in main.rs.
- Verified on QEMU: shadow @ 0x1980020 origin=heap, allocated before
vt::init, fb clean at 0x80000000; all 5 suites PASS; 0 warnings.
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