docs: Clarify Skills feature vs slash commands in changelog

Update the 2.0.20 changelog entry to explain that:
- Skills is a new feature for specialized capabilities
- The Skill tool also handles slash command invocation
- This is an internal change, not a replacement of slash commands
- Slash commands continue to work the same way for users

This addresses confusion where people thought slash commands were
being replaced with skills.

CHANGELOG.md

@@ -1,5 +1,21 @@
 # Changelog
 
+## 2.0.74
+
+- Added LSP (Language Server Protocol) tool for code intelligence features like go-to-definition, find references, and hover documentation
+- Added `/terminal-setup` support for Kitty, Alacritty, Zed, and Warp terminals
+- Added ctrl+t shortcut in `/theme` to toggle syntax highlighting on/off
+- Added syntax highlighting info to theme picker
+- Added guidance for macOS users when Alt shortcuts fail due to terminal configuration
+- Fixed skill `allowed-tools` not being applied to tools invoked by the skill
+- Fixed Opus 4.5 tip incorrectly showing when user was already using Opus
+- Fixed a potential crash when syntax highlighting isn't initialized correctly
+- Fixed visual bug in `/plugins discover` where list selection indicator showed while search box was focused
+- Fixed macOS keyboard shortcuts to display 'opt' instead of 'alt'
+- Improved `/context` command visualization with grouped skills and agents by source, slash commands, and sorted token count
+- [Windows] Fixed issue with improper rendering
+- [VSCode] Added gift tag pictogram for year-end promotion message
+
 ## 2.0.73
 
 - Added clickable `[Image #N]` links that open attached images in the default viewer
@@ -354,7 +370,7 @@
 
 ## 2.0.20
 
-- Added support for Claude Skills
+- Added support for Claude Skills. Skills are a new feature that provide specialized capabilities and domain knowledge to Claude. The internal "Skill" tool also handles slash command invocation (previously done by the "SlashCommand" tool) - this is an internal change to how Claude invokes your slash commands, not a replacement of slash commands. Slash commands continue to work exactly the same way for users.
 
 ## 2.0.19