feat(builder): documented launch options only, and no game-specific code

Launch options must be documented. A draft passed an option its server
doesn't have; servers ignore unknown options, so it booted and passed every
boot test while its setting did nothing. build now reads the pages research
based the variant on, in full, and the drafter rejects any launch option in
the startup command that none of them, nor the image's own scripts, mention.
Shell tools' options (mkdir -p, [ -n ...]) are skipped; the check is off
without sources.

The builder is game-agnostic:
- AUTHORING.md (the model's rules), the research prompt and the schema
  describe the rules without naming a game.
- The draft prompt no longer includes real templates from the repo. Its
  format example is one invented server (no real command, options, ports or
  app id), checked by TestExampleTemplateFollowsTheRules.
- Comments, help texts, BUILDER.md and test fixtures use invented names and
  values.
- TestBuilderIsGameAgnostic reads every game's name and id from games/ and
  fails if any appears in the builder's code, tests, rules, schemas or docs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

cmd/gbrgames/draft_test.go

@@ -2,14 +2,16 @@ package main
 
 import (
 	"encoding/json"
+	"os"
+	"path/filepath"
 	"strings"
 	"testing"
 )
 
 func TestDraftCompletenessNamesMissingSchemaEntries(t *testing.T) {
-	// The Valheim draft that went round in circles: settings in defaultConfig, no configSchema
+	// A draft that went round in circles: settings in defaultConfig, no configSchema
 	game := map[string]any{
-		"defaultPorts":     []any{"2456/udp"},
+		"defaultPorts":     []any{"30000/udp"},
 		"requiredMemoryMb": json.Number("4096"),
 		"defaultConfig":    map[string]any{"ServerName": "x", "ServerPassword": "", "MaxPlayers": json.Number("8")},
 	}
@@ -44,28 +46,28 @@ func TestUnreadSettings(t *testing.T) {
 }
 
 func TestSavesOutsideVolumes(t *testing.T) {
-	// Valheim's real first boot: its own files in ~/.config, plus Steam client logs (noise)
-	valheim := &bootReport{ContainerChanges: []string{
-		"A /home/steam/.config/unity3d/IronGate/Valheim/adminlist.txt",
-		"A /home/steam/.config/unity3d/IronGate/Valheim/bannedlist.txt",
-		"A /home/steam/Steam/logs/connection_log_2456.txt",
+	// A real first boot: the game's own files in ~/.config, plus Steam client logs (noise)
+	home := &bootReport{ContainerChanges: []string{
+		"A /home/steam/.config/example-game/adminlist.txt",
+		"A /home/steam/.config/example-game/bannedlist.txt",
+		"A /home/steam/Steam/logs/connection_log_30000.txt",
 	}}
-	game := map[string]any{"defaultStartupCommand": "./valheim_server.x86_64 -nographics -batchmode -world X"}
-	problems := savesOutsideVolumes(game, valheim)
-	if len(problems) != 1 || !strings.Contains(problems[0], "/home/steam/.config/unity3d/IronGate/Valheim") || strings.Contains(problems[0], "Steam/logs") {
+	game := map[string]any{"defaultStartupCommand": "./example_server -nographics -batchmode -world X"}
+	problems := savesOutsideVolumes(game, home)
+	if len(problems) != 1 || !strings.Contains(problems[0], "/home/steam/.config/example-game") || strings.Contains(problems[0], "Steam/logs") {
 		t.Fatalf("got %v", problems)
 	}
 
 	// Fixed with a save-directory option under /server
-	game["defaultStartupCommand"] = "./valheim_server.x86_64 -nographics -batchmode -world X -savedir /server/saves"
-	if p := savesOutsideVolumes(game, valheim); p != nil {
+	game["defaultStartupCommand"] = "./example_server -nographics -batchmode -world X -datadir /server/saves"
+	if p := savesOutsideVolumes(game, home); p != nil {
 		t.Errorf("redirected template still flagged: %v", p)
 	}
 
-	// ARK's real first boot: only Proton's cache, which is not game data
-	ark := &bootReport{ContainerChanges: []string{"A /home/gameserver/.cache/umu-protonfixes/protonfixes_test.log"}}
-	if p := savesOutsideVolumes(map[string]any{}, ark); p != nil {
-		t.Errorf("ARK proton cache flagged: %v", p)
+	// A Proton server's first boot: only Proton's cache, which is not game data
+	proton := &bootReport{ContainerChanges: []string{"A /home/gameserver/.cache/umu-protonfixes/protonfixes_test.log"}}
+	if p := savesOutsideVolumes(map[string]any{}, proton); p != nil {
+		t.Errorf("proton cache flagged: %v", p)
 	}
 }
 
@@ -86,10 +88,43 @@ func TestImageUnusable(t *testing.T) {
 }
 
 func TestDraftCompletenessRejectsSecrets(t *testing.T) {
-	// The Valheim draft that couldn't be boot-tested: the password mapped to a CI secret nobody created
-	test := map[string]any{"settleSec": json.Number("120"), "secrets": map[string]any{"Password": "VALHEIM_TEST_PASSWORD"}}
+	// A draft that couldn't be boot-tested: the password mapped to a CI secret nobody created
+	test := map[string]any{"settleSec": json.Number("120"), "secrets": map[string]any{"Password": "EXAMPLE_TEST_PASSWORD"}}
 	problems := strings.Join(draftCompleteness(map[string]any{}, test), "\n")
 	if !strings.Contains(problems, "test.yaml has 'secrets' (Password)") {
 		t.Errorf("got:\n%s", problems)
 	}
 }
+
+// The model copies the example's format, so it must pass everything a draft has to pass
+func TestExampleTemplateFollowsTheRules(t *testing.T) {
+	dir := filepath.Join(t.TempDir(), "example-server")
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(dir, "game.yaml"), []byte(exampleTemplate), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(dir, "test.yaml"), []byte("timeoutSec: 2400\n"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	gs, err := compileSchema(filepath.Join("..", "..", "schema", "game.schema.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	ts, err := compileSchema(filepath.Join("..", "..", "schema", "test.schema.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	problems := validateGame(dir, "example-server", gs, ts)
+	g, err := loadMap(filepath.Join(dir, "game.yaml"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	problems = append(problems, draftCompleteness(g, map[string]any{})...)
+	problems = append(problems, splitSettings(g)...)
+	problems = append(problems, portSettings(g)...)
+	for _, p := range problems {
+		t.Error(p)
+	}
+}