chore(module): rename module github.com/mathiasbq/supervisor -> git.d-ma.be/mathias/hyperguild (#42)

Aligns module path with canonical Gitea source (infra ADR-0004) and
repo name. Binary only, no downstream consumers.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Roq1ajWKR5f1hG5Df9wC6A

internal/skills/brain/handlers_test.go

@@ -8,7 +8,7 @@ import (
 	"net/http/httptest"
 	"testing"
 
-	"github.com/mathiasbq/supervisor/internal/skills/brain"
+	"git.d-ma.be/mathias/hyperguild/internal/skills/brain"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )

internal/skills/brain/skill.go

@@ -4,7 +4,7 @@ package brain
 import (
 	"encoding/json"
 
-	"github.com/mathiasbq/supervisor/internal/registry"
+	"git.d-ma.be/mathias/hyperguild/internal/registry"
 )
 
 // Config holds brain skill configuration.