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/golang/coding-style.md

@@ -0,0 +1,26 @@
+# Go Coding Style
+
+> This file extends [common/coding-style.md](../common/coding-style.md) with Go specific content.
+
+## Formatting
+
+- **gofmt** and **goimports** are mandatory — no style debates
+
+## Design Principles
+
+- Accept interfaces, return structs
+- Keep interfaces small (1-3 methods)
+
+## Error Handling
+
+Always wrap errors with context:
+
+```go
+if err != nil {
+    return fmt.Errorf("failed to create user: %w", err)
+}
+```
+
+## Reference
+
+See skill: `golang-patterns` for comprehensive Go idioms and patterns.

rules/golang/hooks.md

@@ -0,0 +1,11 @@
+# Go Hooks
+
+> This file extends [common/hooks.md](../common/hooks.md) with Go specific content.
+
+## PostToolUse Hooks
+
+Configure in `~/.claude/settings.json`:
+
+- **gofmt/goimports**: Auto-format `.go` files after edit
+- **go vet**: Run static analysis after editing `.go` files
+- **staticcheck**: Run extended static checks on modified packages

rules/golang/patterns.md

@@ -0,0 +1,39 @@
+# Go Patterns
+
+> This file extends [common/patterns.md](../common/patterns.md) with Go specific content.
+
+## Functional Options
+
+```go
+type Option func(*Server)
+
+func WithPort(port int) Option {
+    return func(s *Server) { s.port = port }
+}
+
+func NewServer(opts ...Option) *Server {
+    s := &Server{port: 8080}
+    for _, opt := range opts {
+        opt(s)
+    }
+    return s
+}
+```
+
+## Small Interfaces
+
+Define interfaces where they are used, not where they are implemented.
+
+## Dependency Injection
+
+Use constructor functions to inject dependencies:
+
+```go
+func NewUserService(repo UserRepository, logger Logger) *UserService {
+    return &UserService{repo: repo, logger: logger}
+}
+```
+
+## Reference
+
+See skill: `golang-patterns` for comprehensive Go patterns including concurrency, error handling, and package organization.

rules/golang/security.md

@@ -0,0 +1,28 @@
+# Go Security
+
+> This file extends [common/security.md](../common/security.md) with Go specific content.
+
+## Secret Management
+
+```go
+apiKey := os.Getenv("OPENAI_API_KEY")
+if apiKey == "" {
+    log.Fatal("OPENAI_API_KEY not configured")
+}
+```
+
+## Security Scanning
+
+- Use **gosec** for static security analysis:
+  ```bash
+  gosec ./...
+  ```
+
+## Context & Timeouts
+
+Always use `context.Context` for timeout control:
+
+```go
+ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+defer cancel()
+```

rules/golang/testing.md

@@ -0,0 +1,25 @@
+# Go Testing
+
+> This file extends [common/testing.md](../common/testing.md) with Go specific content.
+
+## Framework
+
+Use the standard `go test` with **table-driven tests**.
+
+## Race Detection
+
+Always run with the `-race` flag:
+
+```bash
+go test -race ./...
+```
+
+## Coverage
+
+```bash
+go test -cover ./...
+```
+
+## Reference
+
+See skill: `golang-testing` for detailed Go testing patterns and helpers.