feat: add Go core string and version utility functions

5 funciones Go puras del dominio core: parse_version y compare_versions para
parsing y comparacion semantica de versiones, longest_common_prefix para
encontrar el prefijo comun mas largo entre strings, rel_or_full para devolver
rutas relativas cuando es posible, y split_command_and_arg para separar
comandos de sus argumentos. Todas sin dependencias externas.
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---
name: compare_versions
kind: function
lang: go
domain: core
version: "1.0.0"
purity: pure
signature: "func CompareVersions(a, b string) int"
description: "Compara dos strings de version semantica (semver). Soporta formato con o sin prefijo 'v'. Retorna -1, 0 o 1."
tags: [core, version, semver, compare, parse]
uses_functions: []
uses_types: []
returns: []
returns_optional: false
error_type: ""
imports: [strconv, strings]
params:
- name: a
desc: "primera version (ej: 'v1.4.0' o '1.4.0')"
- name: b
desc: "segunda version"
output: "-1 si a < b, 0 si iguales, 1 si a > b"
tested: false
tests: []
test_file_path: ""
file_path: "functions/core/compare_versions.go"
source_repo: "https://gitea-dgg044oo04woo4ggcsws4gk0.organic-machine.com/egutierrez/DevLauncher.git"
source_license: "MIT"
source_file: "installer/core/version.go"
---
## Ejemplo
```go
core.CompareVersions("v1.4.0", "v1.3.9") // 1
core.CompareVersions("1.0.0", "1.0.0") // 0
core.CompareVersions("v0.9.0", "v1.0.0") // -1
```
## Notas
Compara major.minor.patch como enteros. Ignora pre-release tags y metadata (solo los 3 numeros). Partes faltantes se tratan como 0.