build(go): upgrade to Go 1.27 (#137)

Raise the module to Go 1.27.0 and select exact compatible security and
lint tool versions through the existing reusable workflow inputs.

Self-review completed:
- Scope: only Go 1.27 compatibility, directly required tooling, build, and docs
- Security: scanner coverage, arguments, SARIF, permissions, and policy preserved
- Modules: tidy integrity checked; no unrelated dependency changes
- Verification: Go 1.27 build, vet, tests, race, lint, and scanners exercised

Author: krkt5

.github/workflows/ci.yml

@@ -30,6 +30,7 @@ jobs:
     permissions:
       contents: read
     with:
+      golangci-lint-version: "v2.13.1"
       build-cmd-path: ./cmd/julius
       build-binary-name: julius
     secrets: inherit

.github/workflows/security.yml

@@ -30,4 +30,7 @@ jobs:
       pull-requests: read     # go-sec.yml preflight reads PR files + repo tree
       security-events: write
       actions: read           # required by codeql-action/upload-sarif for run metadata
+    with:
+      gosec-version: "v2.28.0"
+      govulncheck-version: "v1.7.0"
     secrets: inherit

CONTRIBUTING.md

@@ -15,7 +15,7 @@ Thank you for your interest in contributing to Julius, the LLM service fingerpri
 ## Quick Start
 
 1. Fork and clone the repository
-2. Install Go 1.24+
+2. Install Go 1.27.0+
 3. Run tests: `go test ./...`
 4. Make your changes
 5. Submit a pull request

README.md

@@ -4,7 +4,7 @@
 
 > Identify Ollama, vLLM, LiteLLM, and 60+ AI services running on any endpoint in seconds.
 
-[![Go Version](https://img.shields.io/badge/go-1.25+-blue.svg)](https://golang.org/)
+[![Go Version](https://img.shields.io/badge/go-1.27.0+-blue.svg)](https://golang.org/)
 [![License](https://img.shields.io/github/license/praetorian-inc/julius)](LICENSE)
 [![Build Status](https://img.shields.io/github/actions/workflow/status/praetorian-inc/julius/ci.yml?branch=main)](https://github.com/praetorian-inc/julius/actions)
 [![Go Report Card](https://goreportcard.com/badge/github.com/praetorian-inc/julius)](https://goreportcard.com/report/github.com/praetorian-inc/julius)

go.mod

@@ -1,6 +1,6 @@
 module github.com/praetorian-inc/julius
 
-go 1.25.3
+go 1.27.0
 
 require (
 	github.com/goccy/go-yaml v1.19.2