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/firstboot_test.go

@@ -6,21 +6,21 @@ import (
 )
 
 func TestParseConfigFormats(t *testing.T) {
-	// Palworld's Unreal-style list
-	pal := parseConfig("/server/Pal/Saved/Config/LinuxServer/PalWorldSettings.ini", "[/Script/Pal.PalGameWorldSettings]\n"+
-		`OptionSettings=(Difficulty=None,ExpRate=1.000000,ServerName="Default Palworld Server",CrossplayPlatforms=(Steam,Xbox,PS5,Mac))`)
-	want := map[string]string{"Difficulty": "None", "ExpRate": "1.000000", "ServerName": "Default Palworld Server", "CrossplayPlatforms": "(Steam,Xbox,PS5,Mac)"}
-	if len(pal) != len(want) {
-		t.Fatalf("palworld: got %d settings: %+v", len(pal), pal)
+	// An Unreal-style option list
+	list := parseConfig("/server/Game/Saved/Config/LinuxServer/GameSettings.ini", "[/Script/Game.WorldSettings]\n"+
+		`OptionSettings=(Difficulty=None,ExpRate=1.000000,ServerName="Default Server",CrossplayPlatforms=(Steam,Xbox,PS5,Mac))`)
+	want := map[string]string{"Difficulty": "None", "ExpRate": "1.000000", "ServerName": "Default Server", "CrossplayPlatforms": "(Steam,Xbox,PS5,Mac)"}
+	if len(list) != len(want) {
+		t.Fatalf("option list: got %d settings: %+v", len(list), list)
 	}
-	for _, s := range pal {
+	for _, s := range list {
 		if s.Section != "OptionSettings" || want[s.Key] != s.Value {
-			t.Errorf("palworld setting %+v", s)
+			t.Errorf("option list setting %+v", s)
 		}
 	}
 
-	// Minecraft's server.properties
-	mc := parseConfig("/data/server.properties", "#Minecraft server properties\nmax-players=20\nmotd=A Minecraft Server\nlevel-seed=\n")
+	// A server.properties file
+	mc := parseConfig("/data/server.properties", "#Server properties\nmax-players=20\nmotd=A Server\nlevel-seed=\n")
 	if len(mc) != 3 || mc[0].Key != "max-players" || mc[0].Value != "20" || mc[2].Value != "" {
 		t.Errorf("properties: %+v", mc)
 	}
@@ -66,7 +66,7 @@ func TestAnalyzeLines(t *testing.T) {
 		{At: 2, Source: "console", Text: "Failed to load optional module"},
 		{At: 9, Source: "console", Text: "[09:00:01 INFO]: Done (8.1s)! For help, type \"help\""},
 		{At: 9, Source: "console", Text: "[09:00:01 INFO]: Thread RCON Listener started"},
-		// After the stop at 200s: the shutdown, as Minecraft's runner prints it
+		// After the stop at 200s: the shutdown, as a wrapper script prints it
 		{At: 201, Source: "console", Text: "[06:01:39] [RCON Listener #1/INFO]: Thread RCON Client /0:0:0:0:0:0:0:1 started"},
 		{At: 202, Source: "console", Text: "2026-10-25T06:01:39.976Z\tINFO\tmc-server-runner\tDone"},
 	}, []logLine{{At: -1, Source: "/server/x.log", Text: "Listening on 0.0.0.0:7777"}}, 200)
@@ -90,13 +90,13 @@ func TestAnalyzeLines(t *testing.T) {
 
 func TestConfigCandidates(t *testing.T) {
 	for rel, want := range map[string]bool{
-		"server.properties":                      true,
-		"Pal/Saved/Config/LinuxServer/x.ini":     true,
-		"ShooterGame/Saved/Logs/ShooterGame.log": true,
-		"steamapps/appmanifest_123.acf":          false,
-		"Engine/Config/BaseEngine.ini":           false,
-		"plugins/Geyser/config.yml":              false,
-		"world/level.dat":                        false,
+		"server.properties":                   true,
+		"Game/Saved/Config/LinuxServer/x.ini": true,
+		"Game/Saved/Logs/Server.log":          true,
+		"steamapps/appmanifest_123.acf":       false,
+		"Engine/Config/BaseEngine.ini":        false,
+		"plugins/SomePlugin/config.yml":       false,
+		"world/level.dat":                     false,
 	} {
 		if got := isConfigCandidate(rel, 1000); got != want {
 			t.Errorf("isConfigCandidate(%q) = %v, want %v", rel, got, want)