Remove brew --prefix from shell startup (0.95s → 0.08s)

Remove RUBY_CONFIGURE_OPTS with brew --prefix openssl@1.1 from
.zshrc-dhh-additions. It ran on every shell startup (~0.9s) but
was unused — Ruby 4.0 uses OpenSSL 3.x, and the flag only matters
when compiling Ruby from source.

Added legacy Ruby build instructions to QUICK_REFERENCE.md for
users who need to compile old Ruby versions (< 2.4) with OpenSSL 1.1.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: AnjanJ

.zshrc-dhh-additions

@@ -504,9 +504,6 @@ alias hm='heroku run rails db:migrate'
 # 11. ENVIRONMENT SETUP
 # ============================================
 
-# Ruby optimization
-export RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.1)"
-
 # Disable Spring (DHH recommends for simplicity)
 export DISABLE_SPRING=1
 

QUICK_REFERENCE.md

@@ -275,6 +275,24 @@ aerospace reload
 :source ~/.config/nvim/init.lua
 ```
 
+### Installing Legacy Ruby (< 2.4)
+
+Old Ruby versions need OpenSSL 1.1 (modern Ruby uses OpenSSL 3.x automatically). Pass it as a one-off build flag — don't add it to your shell config:
+
+```bash
+# Install openssl@1.1 if you don't have it
+brew install openssl@1.1
+
+# Compile old Ruby with OpenSSL 1.1
+RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.1)" mise install ruby@2.x.x
+```
+
+If you work with legacy projects frequently, add it to `~/.zshrc.local`:
+```bash
+export RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.1)"
+```
+Note: this adds ~0.9s to every shell startup due to the `brew --prefix` call.
+
 ### Reset Everything
 ```bash
 # Neovim