pscripts: test for the script, not the destination directory

[presto8]

The guard tested '! -f $dest' where $dest is ~/.local/bin, a directory.
-f on a directory is always false, so the negation was always true and
all three scripts were re-downloaded from GitHub on every run.

Also replace the implicit "$_" in the chmod with the explicit path and
declare the loop variable local.

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🤖 Generated with Claude Code

[Copilot]

🟢 Approval recommended

The change is a small, targeted correctness fix that prevents repeated downloads and makes the chmod target explicit.

Pull request overview

Fixes the install_pscripts installer guard so it checks for the presence of each script file (rather than the destination directory), preventing unnecessary re-downloads on every run.

Changes:

• Update the existence test to [[ ! -f "$dest/$script" ]] so scripts are only downloaded when missing.
• Replace chmod a+x "$_" with an explicit chmod a+x "$dest/$script" target.
• Declare the loop variable script as local within the function.

File summaries

File	Description
setup	Corrects install_pscripts to test per-script file existence and applies chmod to the explicit downloaded path.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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