fix(aztec-up): narrow PATH cleanup regex to avoid removing user PATH entries

[nchamo]

Problem

The update_path_env_var function in aztec-install uses a broad regex to clean up old aztec PATH entries from the user's shell profile:

grep -Ev 'export PATH=.*/\.aztec/' "$shell_profile"

This matches any export PATH= line containing /.aztec/ anywhere, which means it silently removes user-written PATH lines that happen to include .aztec directories. For example, a user with:

export PATH="/usr/local/bin:$HOME/.aztec/bin:$HOME/go/bin:$PATH"

would have this line deleted every time they run the installer, losing their /usr/local/bin and $HOME/go/bin entries.

PATH formats found in git history

The installer has written two formats over time:

1. Old format (pre-version-manager, 5a80cd7adf): export PATH="$PATH:$HOME/.aztec/bin" — appends aztec to PATH
2. Current format (since f69c7bfe67): export PATH="$HOME/.aztec/current/bin:$HOME/.aztec/current/node_modules/.bin:$HOME/.aztec/bin:$PATH" — prepends aztec to PATH

Both need to be cleaned up on re-install. Neither should cause collateral damage to user lines.

Fix

Replace the broad regex with a targeted alternation that only matches the two known installer-written formats:

grep -Ev 'export PATH="\$(HOME/\.aztec/|PATH:.*\.aztec/)' "$shell_profile"

This matches:

• export PATH="$HOME/.aztec/... — current format (PATH value starts with $HOME/.aztec/)
• export PATH="$PATH:.../.aztec/... — old format (PATH value starts with $PATH: and contains /.aztec/)

And does not match user lines like:

• export PATH="/usr/local/bin:$HOME/.aztec/bin:$HOME/go/bin:$PATH" (doesn't start with $HOME/.aztec or $PATH:)
• export PATH="$HOME/.local/bin:$HOME/.aztec/bin:$PATH" (starts with $HOME/.local, not $HOME/.aztec)
• export PATH="$HOME/.aztec-tools/bin:$PATH" (trailing / after .aztec prevents matching .aztec-tools)

Fixes F-470

[mverzilli]

Yikes this was a nasty one, good thing you're fixing it

[AztecBot]

✅ Successfully backported to backport-to-v4-next-staging #21899.