feat: add Cursor IDE support with pre-translated configs

Add complete .cursor/ directory with rules, agents, skills, commands,
and MCP config adapted for Cursor's format. This makes ecc-universal
a truly cross-IDE package supporting Claude Code, Cursor, and OpenCode.

- 27 rule files with YAML frontmatter (description, globs, alwaysApply)
- 13 agent files with full model IDs and readonly flags
- 30 skill directories (identical Agent Skills standard, no translation)
- 31 command files (5 multi-* stubbed for missing codeagent-wrapper)
- MCP config with Cursor env interpolation syntax
- README.md and MIGRATION.md documentation
- install.sh --target cursor flag for project-scoped installation
- package.json updated with .cursor/ in files and cursor keywords

.cursor/rules/python-hooks.md

@@ -0,0 +1,20 @@
+---
+description: "Python hooks: black/ruff auto-format, mypy/pyright type checking, print() warnings"
+globs: ["**/*.py"]
+alwaysApply: false
+---
+
+# Python Hooks
+
+> This file extends [common/hooks.md](../common/hooks.md) with Python specific content.
+
+## PostToolUse Hooks
+
+Configure in `~/.claude/settings.json`:
+
+- **black/ruff**: Auto-format `.py` files after edit
+- **mypy/pyright**: Run type checking after editing `.py` files
+
+## Warnings
+
+- Warn about `print()` statements in edited files (use `logging` module instead)