[dsaikou618]

The script previously ran on all files found in the stow directories, including python3 and zsh scripts which would false-positive as syntax errors.

This fix adds a shebang filter: which skips files that don't have a bash/sh shebang, so only actual bash shell scripts are checked.

Closes the false-positive issue where python3 and zsh scripts in the stow tree would trigger syntax error reports.

[TriTacLe]

The shebang filter is the right idea but the regex only matches a shebang line ending exactly in "bash" or "sh": ^#!.*[ /](bash|sh)$. A shebang with trailing flags, like #!/bin/bash -e or #!/usr/bin/env -S bash -euo pipefail, no longer ends in "bash"/"sh" and gets silently skipped from syntax checking. No script in the repo currently uses flags, so this doesn't break anything today, but it's a latent gap in exactly the check this PR exists to fix. Consider matching the interpreter name anywhere after bash/sh/-S, e.g. ^#!.*[ /](bash|sh)([ \t]|$).

This PR is also stacked on #139's unmerged branch, so the diff here includes all of that PR's open issues too - worth rebasing once #139 lands.

[TriTacLe]

Closing: the unique fix here is already on master.

The verify-system.sh shebang filter landed in #138, which is merged. Your implementation (grep -qE '^#!.*[ /](bash|sh)$') and the merged one are equivalent, so nothing is lost, but this branch now conflicts with master in that exact file.

Everything else in this PR is the shared profiles base it has in common with #139 and #141, which carries four reverts against current master. Full review on #141.

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