fix(zsh): stop aliasing grep to rg in interactive shells

`alias grep='rg'` made standard grep invocations silently change meaning: rg is
not a drop-in grep replacement. The most common breakage is flags — `grep -E`
means extended regex, but rg's `-E` is --encoding, so a copied command like
`grep -E '^ClientAlive(Interval|CountMax)' /etc/ssh/sshd_config` fails with
"unknown encoding". This breaks pasted support/debugging commands and coding
agents (e.g. Codex) that emit POSIX/GNU grep when they intend grep semantics and
already call `rg` explicitly when they want ripgrep.

This matches the existing principle in the same file for fd ("NOT aliased over
'find' — fd has incompatible syntax"). Replaced the shadowing alias with
non-shadowing convenience aliases `rgrep`/`search` for ripgrep.

Closes #303

Co-Authored-By: Claude <noreply@anthropic.com>

Author: Dicklesworthstone

acfs/zsh/acfs.zshrc

@@ -133,7 +133,13 @@ if command -v fd &>/dev/null; then
 elif command -v fdfind &>/dev/null; then
   alias fd='fdfind'
 fi
-command -v rg &>/dev/null && alias grep='rg'
+# ripgrep as standalone aliases (NOT aliased over 'grep' — rg is not a drop-in
+# replacement: e.g. grep's -E means ERE while rg's -E means --encoding, so
+# `grep -E 'pat' file` breaks under an alias. Same principle as fd/find above.)
+if command -v rg &>/dev/null; then
+  alias rgrep='rg'
+  alias search='rg'
+fi
 command -v dust &>/dev/null && alias du='dust'
 command -v btop &>/dev/null && alias top='btop'
 command -v nvim &>/dev/null && alias vim='nvim'