Add instruction priority hierarchy to using-superpowers skill

Clarifies that user instructions (CLAUDE.md, direct requests) always
take precedence over Superpowers skills, which in turn override
default system prompt behavior. Ensures users remain in control.

Also updates RELEASE-NOTES.md with unreleased changes including
the visual companion feature.

RELEASE-NOTES.md

@@ -1,5 +1,33 @@
 # Superpowers Release Notes
 
+## Unreleased
+
+### New Features
+
+**Visual companion for brainstorming skill**
+
+Added optional browser-based visual companion for brainstorming sessions. When users have a browser available, brainstorming can display interactive screens showing current phase, questions, and design decisions in a more readable format than terminal output.
+
+Components:
+- `lib/brainstorm-server/` - WebSocket server for real-time updates
+- `skills/brainstorming/visual-companion.md` - Integration guide
+- Helper scripts for session management with proper isolation
+- Browser helper library for event capture
+
+The visual companion is opt-in and falls back gracefully to terminal-only operation.
+
+### Improvements
+
+**Instruction priority clarified in using-superpowers**
+
+Added explicit instruction priority hierarchy to prevent conflicts with user preferences:
+
+1. User's explicit instructions (CLAUDE.md, direct requests) — highest priority
+2. Superpowers skills — override default system behavior where they conflict
+3. Default system prompt — lowest priority
+
+This ensures users remain in control. If CLAUDE.md says "don't use TDD" and a skill says "always use TDD," CLAUDE.md wins.
+
 ## v4.2.0 (2026-02-05)
 
 ### Breaking Changes

skills/using-superpowers/SKILL.md

@@ -11,6 +11,16 @@ IF A SKILL APPLIES TO YOUR TASK, YOU DO NOT HAVE A CHOICE. YOU MUST USE IT.
 This is not negotiable. This is not optional. You cannot rationalize your way out of this.
 </EXTREMELY-IMPORTANT>
 
+## Instruction Priority
+
+Superpowers skills override default system prompt behavior, but **user instructions always take precedence**:
+
+1. **User's explicit instructions** (CLAUDE.md, direct requests) — highest priority
+2. **Superpowers skills** — override default system behavior where they conflict
+3. **Default system prompt** — lowest priority
+
+If CLAUDE.md says "don't use TDD" and a skill says "always use TDD," follow CLAUDE.md. The user is in control.
+
 ## How to Access Skills
 
 **In Claude Code:** Use the `Skill` tool. When you invoke a skill, its content is loaded and presented to you—follow it directly. Never use the Read tool on skill files.