feat: Change installation directory to ~/.claude/commands/sc/

- Updated default installation path from ~/.claude/commands/ to ~/.claude/commands/sc/
- This maintains the /sc: namespace through directory organization
- Updated install_commands() default path in install_commands.py
- Updated CLI --target default in main.py to ~/.claude/commands/sc
- Updated list_installed_commands() to look in sc subdirectory
- All tests passing (70 passed, 1 skipped)
- Verified real installation: commands now install to ~/.claude/commands/sc/

Commands retain their /sc: prefix through name field in frontmatter:
- /sc:research - Deep web research
- /sc:index-repo - Repository indexing
- /sc:agent - Specialized AI agents
- /sc:recommend - Command recommendations
- /sc - Main help/dispatcher

Generated with [Claude Code](https://claude.com/claude-code)

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

docs/mistakes/test_database_connection-2025-11-11.md

@@ -0,0 +1,44 @@
+# Mistake Record: test_database_connection
+
+**Date**: 2025-11-11
+**Error Type**: ConnectionError
+
+---
+
+## ❌ What Happened
+
+Could not connect to database
+
+```
+No traceback
+```
+
+---
+
+## 🔍 Root Cause
+
+Not analyzed
+
+---
+
+## 🤔 Why Missed
+
+Not analyzed
+
+---
+
+## ✅ Fix Applied
+
+Ensure database is running and credentials are correct
+
+---
+
+## 🛡️ Prevention Checklist
+
+Not documented
+
+---
+
+## 💡 Lesson Learned
+
+Not documented

docs/mistakes/test_reflexion_with_real_exception-2025-11-11.md

@@ -0,0 +1,44 @@
+# Mistake Record: test_reflexion_with_real_exception
+
+**Date**: 2025-11-11
+**Error Type**: ZeroDivisionError
+
+---
+
+## ❌ What Happened
+
+division by zero
+
+```
+simulated traceback
+```
+
+---
+
+## 🔍 Root Cause
+
+Not analyzed
+
+---
+
+## 🤔 Why Missed
+
+Not analyzed
+
+---
+
+## ✅ Fix Applied
+
+Check denominator is not zero before division
+
+---
+
+## 🛡️ Prevention Checklist
+
+Not documented
+
+---
+
+## 💡 Lesson Learned
+
+Not documented

docs/mistakes/unknown-2025-11-11.md

@@ -0,0 +1,44 @@
+# Mistake Record: unknown
+
+**Date**: 2025-11-11
+**Error Type**: FileNotFoundError
+
+---
+
+## ❌ What Happened
+
+config.json not found
+
+```
+No traceback
+```
+
+---
+
+## 🔍 Root Cause
+
+Not analyzed
+
+---
+
+## 🤔 Why Missed
+
+Not analyzed
+
+---
+
+## ✅ Fix Applied
+
+Create config.json in project root
+
+---
+
+## 🛡️ Prevention Checklist
+
+Not documented
+
+---
+
+## 💡 Lesson Learned
+
+Not documented