chore(fish): Update env files

.fish/README.md

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+# Exported Fish Environment: ros2-assignments
+
+This directory contains a self-contained Fish shell environment that can be used
+without requiring the original Fish configuration.
+
+## Files Structure
+```
+.fish/
+├── activate.fish    # Main environment configuration
+└── README.md        # This file
+```
+
+## Usage
+
+### Automatic Activation (Recommended)
+The environment will automatically activate when you `cd` into this directory
+if your Fish shell is configured with the auto-activation feature that checks
+for `.fish/activate.fish`.
+
+### Manual Activation
+To manually activate the environment, run from the project root:
+```bash
+source ./.fish/activate.fish
+```
+
+### Deactivation
+To deactivate the environment, run:
+```bash
+env deactivate
+```
+
+Or simply `cd` to a different directory if using auto-activation.
+
+## What This Environment Provides
+
+- Custom prompt showing the environment name
+- Environment-specific aliases and functions
+- Custom environment variables
+- Automatic cleanup when deactivated
+
+## Requirements
+
+- Fish shell
+- If this is a ROS2 environment: `bass` plugin (`fisher install edc/bass`)
+
+## Sharing
+
+This environment is completely self-contained. You can:
+1. Copy this directory to another machine
+2. Share it with other Fish shell users
+3. Version control it with your project (add .fish/ to your repo)
+
+The environment will work on any system with Fish shell, regardless of whether
+they have the original environment management system installed.
+
+## Auto-activation Setup
+
+To enable auto-activation for .fish/activate.fish, add this to your Fish config.fish:
+```fish
+function check_and_source_activate
+  if test -f (pwd)/.fish/activate.fish
+    source (pwd)/.fish/activate.fish
+  elif test -f (pwd)/activate.fish
+    source (pwd)/activate.fish
+  end
+end
+
+function cd
+  builtin cd $argv && check_and_source_activate
+end
+```

.fish/activate.fish

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+# Self-contained environment: ros2-assignments
+# Exported on: Tue Sep 23 09:41:57 AM CEST 2025
+# Original environment from: /home/wessel/.config/fish/environments/configs/ros2-assignments
+
+# ROS2 development environment (requires distrobox)
+# Environment: ros2-assignments
+
+# Check if a previous initialization has occurred
+if test -n "$__ENV_INITIALIZED"
+    echo (set_color yellow)"Environment already initialized"(set_color normal)
+    return 0
+end
+
+# Mark as initialized
+set -gx __ENV_INITIALIZED "1"
+set -gx CURRENT_ENV "ros2-assignments"
+
+# Check if running inside distrobox
+if test -f /run/.containerenv; or test -n "$CONTAINER_ID"
+    # Source ROS2 setup files using bass
+    if type -q bass
+        bass source /opt/ros/jazzy/setup.bash
+        if test -f ./install/setup.bash
+            bass source ./install/setup.bash
+        end
+    else
+        echo (set_color red)"Error: bass is required for ROS2 environment. Install with: fisher install edc/bass"(set_color normal)
+        return 1
+    end
+
+    # Set environment variable for the prompt prefix
+    set -gx ROS2_ACTIVE 1
+
+    # Save the original prompt function if it exists
+    # Only save if we don't already have a backup or if current prompt is not from an environment
+    if not functions -q __env_orig_prompt
+        if functions -q fish_prompt
+            functions -c fish_prompt __env_orig_prompt
+        else
+            function __env_orig_prompt
+                echo -n (whoami)'@'(prompt_hostname)' '(set_color $fish_color_cwd)(prompt_pwd)(set_color normal)'> '
+            end
+        end
+    else
+        # If we already have a backup, we're switching environments
+        # No need to create a new backup
+    end
+
+    # Define new prompt with ROS2 prefix
+    function fish_prompt
+        echo -n (set_color magenta)'(ros2-assignments)'(set_color normal)' '
+        __env_orig_prompt
+    end
+
+    # ROS2 aliases and functions
+    alias cb="colcon build"
+    alias cbs="colcon build --symlink-install"
+    alias cbt="colcon build --packages-select"
+    alias ct="colcon test"
+    alias ctr="colcon test-result"
+
+    echo (set_color green)"Activated ROS2 environment: ros2-assignments"(set_color normal)
+else
+    echo (set_color red)"This ROS2 environment should only be run inside a distrobox container"(set_color normal)
+    return 1
+end
+
+# Custom deactivation function
+function __env_custom_deactivate
+    # Remove ROS2-specific variables and aliases
+    set -e ROS2_ACTIVE
+    functions -e cb cbs cbt ct ctr 2>/dev/null
+
+    echo (set_color blue)"ROS2 environment cleanup completed"(set_color normal)
+end

activate.fish

@@ -1,36 +0,0 @@
-export env_name="ros2-assignments"
-
-# Check if a previous initialization has occurred
-if test -n "$__ACTIVATE_INITIALIZED"
-    exit 1
-end
-
-export __ACTIVATE_INITIALIZED="1"
-
-# Check if running inside distrobox
-if test -f /run/.containerenv; or test -n "$CONTAINER_ID"
-    bass source /opt/ros/jazzy/setup.bash
-    bass source ./install/setup.bash
-    # Set environment variable for the prompt prefix
-    set -gx ROS2_LECTURES_ACTIVE 1
-
-    # Save the original prompt function if it exists
-    if not functions -q __ros2_lectures_orig_prompt
-        if functions -q fish_prompt
-            functions -c fish_prompt __ros2_lectures_orig_prompt
-        else
-            function __ros2_lectures_orig_prompt
-                echo -n (whoami)'@'(prompt_hostname)' '(set_color $fish_color_cwd)(prompt_pwd)(set_color normal)'> '
-            end
-        end
-    end
-
-    # Define new prompt with ros2-lectures prefix
-    function fish_prompt
-        echo -n (set_color green)'('$env_name')'(set_color normal)
-        __ros2_lectures_orig_prompt
-    end
-else
-    echo "This script should only be run inside a distrobox container"
-    exit 1
-end