boot: the /system tree is the system image — loader-built ramdisk, spawn by path

Retire the build-time ramdisk packer and the packed initial-ramdisk.img.
make-fat-image.py now lays every user binary out at its FHS path on the
boot volume (system/services, system/drivers, system/tests), and the EFI
loader walks \system at boot, packing what it finds into an in-RAM v2
initial_ramdisk whose entry names are full FHS paths. init rides the
table like every other binary: its dedicated handoff fields are gone and
the kernel spawns PID 1 via the same lookup as everyone else
(process.spawnBundled).

system_spawn resolves names by exact path first, then unique basename,
and normalizes argv[0] to the stored path — so task names (and, next,
the tagged log ring's attribution) are honest binary paths everywhere.
initrd v2 rejects the old magic so a stale image fails loudly.

Groundwork for per-process logging (/var/log/<boot-stamp>/<binary-path>.log)
and the kernel-VFS /system mount.

tools/make-initial-ramdisk.py

@@ -1,48 +0,0 @@
-#!/usr/bin/env python3
-"""Build-time initial_ramdisk packer. Concatenates user binaries into one image the
-bootloader ferries to the kernel.
-
-Usage: make-initial-ramdisk.py <out.img> [<name> <file>]...
-
-Image layout (little-endian), mirroring src/user/proto/initial-ramdisk.zig:
-    Header   : magic u32 ("DNRD"=0x444E5244), count u32
-    Entry*N  : name [32]u8 (NUL-padded), offset u64, len u64
-    blobs    : each entry's file bytes at its offset
-"""
-import struct
-import sys
-
-MAGIC = 0x444E5244
-HEADER = struct.Struct("<II")     # magic, count
-ENTRY = struct.Struct("<32sQQ")   # name[32], offset, len
-
-
-def main() -> int:
-    out_path = sys.argv[1]
-    rest = sys.argv[2:]
-    if len(rest) % 2 != 0:
-        sys.stderr.write("usage: make-initial-ramdisk.py <out.img> [<name> <file>]...\n")
-        return 2
-    items = [(rest[i], rest[i + 1]) for i in range(0, len(rest), 2)]
-
-    table_end = HEADER.size + len(items) * ENTRY.size
-    entries = b""
-    blobs = []
-    off = table_end
-    for name, path in items:
-        with open(path, "rb") as f:
-            data = f.read()
-        entries += ENTRY.pack(name.encode()[:31], off, len(data))
-        blobs.append(data)
-        off += len(data)
-
-    with open(out_path, "wb") as f:
-        f.write(HEADER.pack(MAGIC, len(items)))
-        f.write(entries)
-        for b in blobs:
-            f.write(b)
-    return 0
-
-
-if __name__ == "__main__":
-    sys.exit(main())