Add Turkish (tr) docs and update README (#744)

* Add Turkish (tr) docs and update README

Add a full set of Turkish documentation under docs/tr (agents, changelog, CLAUDE guide, contributing, code of conduct, and many agents/commands/skills/rules files). Update README to include a link to the Turkish docs and increment the supported language count from 5 to 6. This commit adds localized guidance and references to help Turkish-speaking contributors and users.

* Update docs/tr/TROUBLESHOOTING.md

Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>

* Update docs/tr/README.md

Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>

* docs(tr): fix license link and update readmes

Update Turkish docs: change license badge link to point to repository root (../../LICENSE), increment displayed language count from 5 to 6, and remove two outdated related links from docs/tr/examples/README.md to keep references accurate.

* Update docs/tr/commands/instinct-import.md

Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>

* Update docs/tr/commands/checkpoint.md

Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>

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Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>

docs/tr/rules/golang/coding-style.md

@@ -0,0 +1,32 @@
+---
+paths:
+  - "**/*.go"
+  - "**/go.mod"
+  - "**/go.sum"
+---
+# Go Kodlama Stili
+
+> Bu dosya [common/coding-style.md](../common/coding-style.md) dosyasını Go'ya özgü içerikle genişletir.
+
+## Formatlama
+
+- **gofmt** ve **goimports** zorunludur — stil tartışması yok
+
+## Tasarım İlkeleri
+
+- Interface'leri kabul et, struct'ları döndür
+- Interface'leri küçük tut (1-3 metot)
+
+## Hata Yönetimi
+
+Hataları daima context ile sarmalayın:
+
+```go
+if err != nil {
+    return fmt.Errorf("failed to create user: %w", err)
+}
+```
+
+## Referans
+
+Kapsamlı Go idiom'ları ve pattern'leri için skill: `golang-patterns` dosyasına bakın.