feat: initial fish shell configuration

- Core config layered on CachyOS base with Catppuccin Mocha theming
- Fisher plugins: fzf.fish, catppuccin, autopair, replay, puffer-fish, magic-enter, spark
- Smart CLI wrappers with fallbacks (bat, lsd, btop, dust, prettyping)
- Custom functions: git, docker, network, kitty, AI session management
- Extensive abbreviation system for keyboard-driven workflows
- Secrets/local sourcing pattern for private and machine-specific config
- README with full documentation and personalization guide
- AGPLv3+ license with copyright headers on all source files

functions/git-clean.fish

@@ -0,0 +1,56 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+function git-clean --description 'Sync main, prune remotes, and delete orphaned branches'
+    set -l options h/help f/force
+    argparse $options -- $argv
+    or return
+
+    if set -q _flag_help
+        echo (set_color --bold blue)"Usage: "(set_color normal)"git-clean [OPTIONS]"
+        echo
+        echo "Steps taken:"
+        echo "  1. Fetches and prunes to find deleted remote branches."
+        echo "  2. Switches to main if you are on an orphaned branch."
+        echo "  3. Pulls the latest changes from the remote."
+        echo "  4. Deletes local orphaned branches."
+        return 0
+    end
+
+    # 1. Fetch and prune (Quietly)
+    echo (set_color blue)"Fetching and pruning remote tracking..."(set_color normal)
+    git fetch --prune --quiet
+
+    # 2. Identify orphaned branches and current branch
+    set -l gone_branches (git branch -vv | awk '/: gone\]/ {gsub(/\*/, ""); print $1}')
+    set -l current_branch (git branch --show-current)
+
+    if test -n "$gone_branches"
+        # 3. Move to safety if needed (Quietly)
+        if contains "$current_branch" $gone_branches
+            echo (set_color yellow)"Current branch '$current_branch' was deleted on remote. Moving to main..."(set_color normal)
+            # Redirecting output to /dev/null to hide the 'Switched to branch' message
+            git checkout main >/dev/null 2>&1; or git checkout master >/dev/null 2>&1
+        end
+    end
+
+    # 4. Update the current branch (Quietly)
+    echo (set_color blue)"Updating current branch..."(set_color normal)
+    git pull --quiet
+
+    # 5. Final cleanup
+    if test -n "$gone_branches"
+        set -l delete_flag -d
+        if set -q _flag_force
+            set -l delete_flag -D
+        end
+
+        echo (set_color red)"Deleting orphaned local branches ($delete_flag):"(set_color normal)
+        for branch in $gone_branches
+            # We keep this output so you can see confirmation of which hashes were deleted
+            git branch $delete_flag $branch
+        end
+    else
+        echo (set_color green)"Everything is tidy. No orphaned branches found."(set_color normal)
+    end
+end