refactor: restructure specs and plans directories

- Specs (brainstorming output) now go to docs/superpowers/specs/
- Plans (writing-plans output) now go to docs/superpowers/plans/
- User preferences for locations override these defaults
- Update all skill references and test files

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/explicit-skill-requests/prompts/action-oriented.txt

@@ -1,3 +1,3 @@
-The plan is done. docs/plans/auth-system.md has everything.
+The plan is done. docs/superpowers/plans/auth-system.md has everything.
 
 Do subagent-driven development on this - start with Task 1, dispatch a subagent, then we'll review.

tests/explicit-skill-requests/prompts/after-planning-flow.txt

@@ -1,4 +1,4 @@
-Great, the plan is complete. I've saved it to docs/plans/auth-system.md.
+Great, the plan is complete. I've saved it to docs/superpowers/plans/auth-system.md.
 
 Here's a summary of what we designed:
 - Task 1: Add User Model with email/password fields

tests/explicit-skill-requests/prompts/claude-suggested-it.txt

@@ -1,5 +1,5 @@
 [Previous assistant message]:
-Plan complete and saved to docs/plans/auth-system.md.
+Plan complete and saved to docs/superpowers/plans/auth-system.md.
 
 Two execution options:
 1. Subagent-Driven (this session) - I dispatch a fresh subagent per task, review between tasks, fast iteration within this conversation

tests/explicit-skill-requests/prompts/i-know-what-sdd-means.txt

@@ -1,4 +1,4 @@
-I have my implementation plan ready at docs/plans/auth-system.md.
+I have my implementation plan ready at docs/superpowers/plans/auth-system.md.
 
 I want to use subagent-driven-development to execute it. That means:
 - Dispatch a fresh subagent for each task in the plan

tests/explicit-skill-requests/prompts/mid-conversation-execute-plan.txt

@@ -1,3 +1,3 @@
-I have a plan at docs/plans/auth-system.md that's ready to implement.
+I have a plan at docs/superpowers/plans/auth-system.md that's ready to implement.
 
 subagent-driven-development, please

tests/explicit-skill-requests/prompts/skip-formalities.txt

@@ -1,3 +1,3 @@
-Plan is at docs/plans/auth-system.md.
+Plan is at docs/superpowers/plans/auth-system.md.
 
 subagent-driven-development, please. Don't waste time - just read the plan and start dispatching subagents immediately.

tests/explicit-skill-requests/run-claude-describes-sdd.sh

@@ -12,7 +12,7 @@ OUTPUT_DIR="/tmp/superpowers-tests/${TIMESTAMP}/explicit-skill-requests/claude-d
 mkdir -p "$OUTPUT_DIR"
 
 PROJECT_DIR="$OUTPUT_DIR/project"
-mkdir -p "$PROJECT_DIR/docs/plans"
+mkdir -p "$PROJECT_DIR/docs/superpowers/plans"
 
 echo "=== Test: Claude Describes SDD First ==="
 echo "Output dir: $OUTPUT_DIR"
@@ -21,7 +21,7 @@ echo ""
 cd "$PROJECT_DIR"
 
 # Create a plan
-cat > "$PROJECT_DIR/docs/plans/auth-system.md" << 'EOF'
+cat > "$PROJECT_DIR/docs/superpowers/plans/auth-system.md" << 'EOF'
 # Auth System Implementation Plan
 
 ## Task 1: Add User Model
@@ -36,7 +36,7 @@ EOF
 
 # Turn 1: Have Claude describe execution options including SDD
 echo ">>> Turn 1: Ask Claude to describe execution options..."
-claude -p "I have a plan at docs/plans/auth-system.md. Tell me about my options for executing it, including what subagent-driven-development means and how it works." \
+claude -p "I have a plan at docs/superpowers/plans/auth-system.md. Tell me about my options for executing it, including what subagent-driven-development means and how it works." \
     --model haiku \
     --plugin-dir "$PLUGIN_DIR" \
     --dangerously-skip-permissions \

tests/explicit-skill-requests/run-extended-multiturn-test.sh

@@ -12,7 +12,7 @@ OUTPUT_DIR="/tmp/superpowers-tests/${TIMESTAMP}/explicit-skill-requests/extended
 mkdir -p "$OUTPUT_DIR"
 
 PROJECT_DIR="$OUTPUT_DIR/project"
-mkdir -p "$PROJECT_DIR/docs/plans"
+mkdir -p "$PROJECT_DIR/docs/superpowers/plans"
 
 echo "=== Extended Multi-Turn Test ==="
 echo "Output dir: $OUTPUT_DIR"

tests/explicit-skill-requests/run-haiku-test.sh

@@ -12,7 +12,7 @@ OUTPUT_DIR="/tmp/superpowers-tests/${TIMESTAMP}/explicit-skill-requests/haiku"
 mkdir -p "$OUTPUT_DIR"
 
 PROJECT_DIR="$OUTPUT_DIR/project"
-mkdir -p "$PROJECT_DIR/docs/plans"
+mkdir -p "$PROJECT_DIR/docs/superpowers/plans"
 mkdir -p "$PROJECT_DIR/.claude"
 
 echo "=== Haiku Model Test with User CLAUDE.md ==="
@@ -31,7 +31,7 @@ else
 fi
 
 # Create a dummy plan file
-cat > "$PROJECT_DIR/docs/plans/auth-system.md" << 'EOF'
+cat > "$PROJECT_DIR/docs/superpowers/plans/auth-system.md" << 'EOF'
 # Auth System Implementation Plan
 
 ## Task 1: Add User Model

tests/explicit-skill-requests/run-multiturn-test.sh

@@ -16,7 +16,7 @@ mkdir -p "$OUTPUT_DIR"
 
 # Create project directory (conversation is cwd-based)
 PROJECT_DIR="$OUTPUT_DIR/project"
-mkdir -p "$PROJECT_DIR/docs/plans"
+mkdir -p "$PROJECT_DIR/docs/superpowers/plans"
 
 echo "=== Multi-Turn Explicit Skill Request Test ==="
 echo "Output dir: $OUTPUT_DIR"
@@ -27,7 +27,7 @@ echo ""
 cd "$PROJECT_DIR"
 
 # Create a dummy plan file
-cat > "$PROJECT_DIR/docs/plans/auth-system.md" << 'EOF'
+cat > "$PROJECT_DIR/docs/superpowers/plans/auth-system.md" << 'EOF'
 # Auth System Implementation Plan
 
 ## Task 1: Add User Model
@@ -59,7 +59,7 @@ echo ""
 # Turn 2: Continue with more planning detail
 echo ">>> Turn 2: Continuing planning..."
 TURN2_LOG="$OUTPUT_DIR/turn2.json"
-claude -p "Good analysis. I've already written the plan to docs/plans/auth-system.md. Now I'm ready to implement. What are my options for execution?" \
+claude -p "Good analysis. I've already written the plan to docs/superpowers/plans/auth-system.md. Now I'm ready to implement. What are my options for execution?" \
     --continue \
     --plugin-dir "$PLUGIN_DIR" \
     --dangerously-skip-permissions \

tests/explicit-skill-requests/run-test.sh

@@ -43,10 +43,10 @@ cp "$PROMPT_FILE" "$OUTPUT_DIR/prompt.txt"
 
 # Create a minimal project directory for the test
 PROJECT_DIR="$OUTPUT_DIR/project"
-mkdir -p "$PROJECT_DIR/docs/plans"
+mkdir -p "$PROJECT_DIR/docs/superpowers/plans"
 
 # Create a dummy plan file for mid-conversation tests
-cat > "$PROJECT_DIR/docs/plans/auth-system.md" << 'EOF'
+cat > "$PROJECT_DIR/docs/superpowers/plans/auth-system.md" << 'EOF'
 # Auth System Implementation Plan
 
 ## Task 1: Add User Model