chore: replace egrep with grep -E

João Pereirarequested to merge
egrep-to-grep into master

Related to #

Problem

The repository shows the warning "egrep: warning: egrep is obsolescent" on some systems. We should use the POSIX replacement grep -E to avoid this warning.

Root Cause

The Makefile used egrep -E, which is deprecated on some platforms and prints an obsolescence warning.

Change

  • Replace egrep -E with grep -E in Makefile.

Rationale

grep -E is the portable replacement for egrep and avoids deprecation warnings.

Test Plan

  • Run make test locally (all tests passed in a separate worktree).

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