port into a clean script instead of editing the original in place

Your call, and the right one. Editing in place let mis-grouped code sit unnoticed
until it scrolled past in a live run — which is exactly how the four upstream
binaries buried in "System Update & Essentials" were found. Porting forces the
question of where each thing belongs before it runs, not after.

machine-setup.sh now contains only what has actually been worked through:
pre-flight, system update and core packages, command-line tools, and the summary.
1149 lines down to 172. The sections still to come are listed in a NOT PORTED YET
block, in order, and each arrives as its own commit.

The original is beside the other superseded scripts as
scripts/setup-old/setup-ubuntu.sh — verified byte-identical to the live
/root/ubuntu-setup copy — so porting reads from a file in the repo rather than
from root's home.

Two claims trimmed from the ported summary, because they were true of the old
script and not of this one yet: it reported the shell as "zsh (Oh My Zsh +
Starship)" unconditionally, and told you to reconnect as a user it had not
created. Replaced with what pre-flight actually knows — system, role, user.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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