Sweep: Replace x-hack in shellcheck script

[sweep-nightly[bot]]

• In lib/tools/shellcheck.sh, replace all instances of the 'x-hack' with the '==' operator for comparison in bash or '=' operator in POSIX shell without the 'x' prefix.

Parent issue: #11

Checklist

- [X] `lib/tools/shellcheck.sh` ❌ Failed

• Replace all instances of the 'x-hack' with the appropriate comparison operator. If the script is intended to be POSIX-compliant, use the '=' operator. If it's specifically a bash script, use the '==' operator.

[sweep-nightly[bot]]

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File Path	Proposed Changes
lib/tools/shellcheck.sh	Modify lib/tools/shellcheck.sh with contents: • Replace all instances of the 'x-hack' with the appropriate comparison operator. If the script is intended to be POSIX-compliant, use the '=' operator. If it's specifically a bash script, use the '==' operator.

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