Use map for generated model registry data

Replaces []ModelDefinition with map[string]ModelDefinition so
model ID uniqueness is enforced by the data structure itself
and lookups do not require a linear scan.

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

internal/cmd/genmodels/main.go

@@ -118,7 +118,7 @@ func main() {
 
 package llm
 
-var generatedModels = []ModelDefinition{
+var generatedModels = map[string]ModelDefinition{
 `,
 		iscHeader,
 		openRouterURL,
@@ -134,8 +134,7 @@ var generatedModels = []ModelDefinition{
 
 		fmt.Fprintf(
 			&buf,
-			`	{
-		ID:              %q,
+			`	%q: {
 		Name:            %q,
 		Provider:        %q,
 		ContextLength:   %d,

pkg/llm/registry.go

@@ -19,8 +19,6 @@ import (
 	"sync"
 )
 
-//go:generate go run go.probo.inc/probo/internal/cmd/genmodels
-
 type (
 	// ModelDefinition describes a model's capabilities and limits.
 	ModelDefinition struct {
@@ -61,11 +59,11 @@ var (
 )
 
 // NewRegistry builds a registry from the given model definitions.
-func NewRegistry(models []ModelDefinition) *Registry {
+func NewRegistry(models map[string]ModelDefinition) *Registry {
 	r := &Registry{byID: make(map[string]*ModelDefinition, len(models)*3)}
-	for i := range models {
-		m := &models[i]
-		r.index(m)
+	for id, m := range models {
+		m.ID = id
+		r.index(&m)
 	}
 	return r
 }