docs: update documentation for Go 1.25.6 and code quality improvements

- Update Go version requirement from 1.25.5 to 1.25.6 in all docs (security fix)
- Add golangci-lint tooling information to CONTRIBUTING.md
- Document code quality improvements in STATUS.md including:
  - Security vulnerability resolution (GO-2026-4340)
  - Cyclomatic complexity reduction for 5 functions
  - Comprehensive error handling improvements
  - Complete style and formatting compliance
- Add code quality metrics section showing production readiness
- Update development workflow to include modern linting tools

Ensures documentation accurately reflects current security and quality status.

CONTRIBUTING.md

@@ -24,7 +24,7 @@ This project adheres to our [Code of Conduct](CODE_OF_CONDUCT.md). By participat
 
 ### Prerequisites
 
-- **Go 1.25.5 or later**: [Download Go](https://golang.org/dl/)
+- **Go 1.25.6 or later**: [Download Go](https://golang.org/dl/)
 - **Git**: For version control
 - **Make**: For build automation (optional but recommended)
 - **SoundTouch Device**: For testing (optional but valuable)
@@ -135,6 +135,12 @@ make build
 # Run linting and formatting
 make check
 
+# Run golangci-lint specifically
+golangci-lint run
+
+# Auto-fix linting issues where possible
+golangci-lint run --fix
+
 # Install CLI locally
 go install ./cmd/soundtouch-cli
 
@@ -198,7 +204,8 @@ SOUNDTOUCH_DEBUG=true
 Follow standard Go conventions:
 
 - **gofmt** for formatting
-- **golint** and **go vet** for code quality
+- **golangci-lint** for comprehensive code quality checks
+- **go vet** for static analysis
 - **Effective Go** principles
 - **Standard library patterns** where applicable
 

README.md

@@ -327,7 +327,7 @@ This library supports all Bose SoundTouch-compatible devices, including:
 ## Development
 
 ### Prerequisites
-- Go 1.25.5 or later
+- Go 1.25.6 or later
 - Optional: SoundTouch device for testing
 
 ### Building from Source

docs/GETTING-STARTED.md

@@ -6,7 +6,7 @@ This guide will get you up and running with the SoundTouch Go client in under 10
 
 ## 📋 **Prerequisites**
 
-- **Go 1.25.5 or later** installed on your system
+- **Go 1.25.6 or later** installed on your system
 - **Bose SoundTouch device** on your network (SoundTouch 10, 20, 30, etc.)
 - **Same network** - Your computer and SoundTouch device must be on the same network
 

docs/SERVICE-AVAILABILITY-IMPLEMENTATION.md

@@ -245,7 +245,7 @@ BenchmarkGetServiceAvailability-8                         1000    1.2ms/op
 
 - **Standard library only** - No external dependencies beyond existing project requirements
 - **Backward compatible** - Works with existing client configurations
-- **Go version support** - Compatible with Go 1.25.5+
+- **Go version support** - Compatible with Go 1.25.6+
 
 ## Documentation
 

docs/STATUS.md

@@ -210,7 +210,7 @@ This project implements a comprehensive Go client library and CLI tool for Bose
 - Development convenience commands ✅
 
 ### Dependencies
-- Modern Go modules (Go 1.25.5+) ✅
+- Modern Go modules (Go 1.25.6+) ✅
 - Minimal external dependencies ✅
 - Standard library focus ✅
 
@@ -263,6 +263,12 @@ This project implements a comprehensive Go client library and CLI tool for Bose
 - [ ] Web application interface
 
 ### Recent Major Updates
+- **2026-02-01**: Code quality improvements - Resolved all golangci-lint issues (59→0)
+  - ✅ Security: Updated Go 1.25.5→1.25.6 to fix TLS vulnerability GO-2026-4340
+  - ✅ Complexity: Refactored 5 high-complexity functions for better maintainability
+  - ✅ Error Handling: Fixed unchecked error returns and improved error messages
+  - ✅ Style: Applied comprehensive code formatting and style improvements
+  - ✅ Testing: Enhanced test helper functions and removed unused code
 - **2026-01-09**: Preset management (read-only) with comprehensive analysis methods
 - **2026-01-09**: Balance control implementation completing audio management trilogy
 - **2026-01-09**: Bass control implementation with range validation and convenience methods
@@ -288,9 +294,19 @@ This project implements a comprehensive Go client library and CLI tool for Bose
 
 ### Development Notes
 - All major architectural decisions documented
-- Code follows Go best practices
+- Code follows Go best practices with comprehensive linting enforcement
 - Tests provide excellent regression protection
 - Real device testing ensures API compatibility
+- Zero security vulnerabilities (verified with govulncheck)
+- Production-ready code quality with automated formatting and style checks
+
+### Code Quality Metrics
+- ✅ **Security**: Zero vulnerabilities, modern Go version (1.25.6+)
+- ✅ **Maintainability**: All functions under cyclomatic complexity threshold (<15)
+- ✅ **Error Handling**: Comprehensive error checking and proper error wrapping
+- ✅ **Testing**: Test helpers with proper t.Helper() calls, no unused code
+- ✅ **Style**: Consistent formatting with golangci-lint enforcement
+- ✅ **Documentation**: Complete API documentation with proper comments
 
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