feat: add shared shell utilities

- Add common aliases, exports, and functions
- Add shell completions and prompt configuration
- Add sync utilities for cross-shell compatibility

🤖 Generated with [Claude Code](https://claude.ai/code)

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

shared/exports

@@ -0,0 +1,34 @@
+# Environment Variables
+# Shared across all shells
+
+# Editor preferences
+export EDITOR=vim
+export VISUAL=vim
+export PAGER=less
+
+# Path modifications
+export PATH="$HOME/.local/bin:$HOME/bin:/usr/local/bin:$PATH"
+export PATH="~/.npm-global/bin:$PATH"
+export PATH="/home/eric/.opencode/bin:$PATH"
+
+# History settings
+export HISTSIZE=10000
+export HISTFILESIZE=20000
+export HISTCONTROL=ignoreboth:erasedups
+
+# Color support
+export CLICOLOR=1
+export LSCOLORS=ExFxBxDxCxegedabagacad
+
+# Less configuration
+export LESS='-R -i -M -F -X'
+
+# Locale settings
+export LC_ALL=en_US.UTF-8
+export LANG=en_US.UTF-8
+
+# Development tools
+export GREP_OPTIONS='--color=auto'
+
+# Custom environment variables
+export LOCAL_ENDPOINT=http://10.13.0.254:11434/v1