chore: rebrand backone names, add lint gate + agent docs

- CI: build/validate use backone selftest + binary names, add lint.yml
- make-*.mk: emit/install backone binaries, drop zerotier-one paths
- doc/debian/ext.installfiles: backone manpages, service, init, te
- rule-compiler: npm test runs test.js; attic world planet files
- AGENTS.md repository guidelines, tools/lint.sh changed-lines gate
- gitignore: /backone-selftest, *.gcno, *.gcda

rule-compiler/package.json

@@ -3,9 +3,9 @@
   "version": "1.2.2-2",
   "description": "ZeroTier Rule Script Compiler",
   "main": "cli.js",
-  "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
-  },
+	"scripts": {
+		"test": "node test.js"
+	},
   "repository": {
     "type": "git",
     "url": "https://github.com/zerotier/ZeroTierOne/rule-compiler"