feat(mcp): implement double-insurance global-only MCP and testing rules installation

- Install MCP configs and Artemis mobile testing rules strictly into user home directories (~), avoiding project workspace pollution
- Add double-insurance rules synchronization injecting into both primary global instruction files (e.g. ~/.gemini/GEMINI.md, ~/.claude/CLAUDE.md, ~/.cursorrules, ~/.codeium/windsurf/memories/global_rules.md) and modular rules/ directories
- Support JSONC parsing (comments and trailing commas) and automatic .bak backups when merging existing IDE configuration files
- Update README and Quick Start documentation to clarify automatic global MCP & rule mounting across all major AI IDEs

.gitignore

@@ -56,6 +56,16 @@ dmypy.json
 # IDEs & Editors
 .vscode/
 .idea/
+.cursor/
+.gemini/
+.claude/
+.windsurf/
+.cline/
+.roo/
+.openclaw/
+.clinerules
+.windsurfrules
+.roorules
 *.swp
 *.swo
 *~
@@ -80,6 +90,7 @@ scratch/
 data_engine.db
 data_engine.db-journal
 .ipc_port
+.artemis_ipc_port
 .ls_address
 .jetski_ls_address