refactor(rules): restructure into common + language-specific directories

* refactor(rules): restructure rules into common + language-specific directories

- Split 8 flat rule files into common/, typescript/, python/, golang/
- common/ contains language-agnostic principles (no code examples)
- typescript/ extracts TS/JS specifics (Zod, Playwright, Prettier hooks, etc.)
- python/ adds Python rules (PEP 8, pytest, black/ruff, bandit)
- golang/ adds Go rules (gofmt, table-driven tests, gosec, functional options)
- Replace deprecated ultrathink with extended thinking documentation
- Add README.md with installation guide and new-language template

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

* Fix installation commands for rules

Updated installation instructions to copy all rules to a single directory.

* docs: update README.md to reflect new rules directory structure

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

---------

Co-authored-by: Hor1zonZzz <Hor1zonZzz@users.noreply.github.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

rules/README.md

@@ -0,0 +1,63 @@
+# Rules
+
+## Structure
+
+Rules are organized into a **common** layer plus **language-specific** directories:
+
+```
+rules/
+├── common/          # Language-agnostic principles (always install)
+│   ├── coding-style.md
+│   ├── git-workflow.md
+│   ├── testing.md
+│   ├── performance.md
+│   ├── patterns.md
+│   ├── hooks.md
+│   ├── agents.md
+│   └── security.md
+├── typescript/      # TypeScript/JavaScript specific
+├── python/          # Python specific
+└── golang/          # Go specific
+```
+
+- **common/** contains universal principles — no language-specific code examples.
+- **Language directories** extend the common rules with framework-specific patterns, tools, and code examples. Each file references its common counterpart.
+
+## Installation
+
+```bash
+# Install common rules (required for all projects)
+cp -r rules/common/* ~/.claude/rules/
+
+# Install language-specific rules based on your project's tech stack
+cp -r rules/typescript/* ~/.claude/rules/
+cp -r rules/python/* ~/.claude/rules/
+cp -r rules/golang/* ~/.claude/rules/
+
+# Attention ! ! ! Configure according to your actual project requirements; the configuration here is for reference only.
+
+```
+
+## Rules vs Skills
+
+- **Rules** define standards, conventions, and checklists that apply broadly (e.g., "80% test coverage", "no hardcoded secrets").
+- **Skills** (`skills/` directory) provide deep, actionable reference material for specific tasks (e.g., `python-patterns`, `golang-testing`).
+
+Language-specific rule files reference relevant skills where appropriate. Rules tell you *what* to do; skills tell you *how* to do it.
+
+## Adding a New Language
+
+To add support for a new language (e.g., `rust/`):
+
+1. Create a `rules/rust/` directory
+2. Add files that extend the common rules:
+   - `coding-style.md` — formatting tools, idioms, error handling patterns
+   - `testing.md` — test framework, coverage tools, test organization
+   - `patterns.md` — language-specific design patterns
+   - `hooks.md` — PostToolUse hooks for formatters, linters, type checkers
+   - `security.md` — secret management, security scanning tools
+3. Each file should start with:
+   ```
+   > This file extends [common/xxx.md](../common/xxx.md) with <Language> specific content.
+   ```
+4. Reference existing skills if available, or create new ones under `skills/`.