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

service/README.md

@@ -41,7 +41,14 @@ Settings available in `local.conf` (this is not valid JSON, and JSON does not al
 		"allowManagementFrom": [ "NETWORK/bits", ...] |null, /* If non-NULL, allow JSON/HTTP management from this IP network. Default is 127.0.0.1 only. */
 		"bind": [ "ip",... ], /* If present and non-null, bind to these IPs instead of to each interface (wildcard IP allowed) */
 		"allowTcpFallbackRelay": true|false, /* Allow or disallow establishment of TCP relay connections (true by default) */
-		"multipathMode": 0|1|2 /* multipath mode: none (0), random (1), proportional (2) */
+		"multipathMode": 0|1|2, /* multipath mode: none (0), random (1), proportional (2) */
+		"redis": { /* Optional, requires controllerDbPath starting with "postgres:" */
+			"hostname": "str", /* Redis server host */
+			"port": 1-65535, /* Redis server port */
+			"password": "str", /* Auth password, "" for none */
+			"clusterMode": true|false, /* Connect via RedisCluster instead of standalone */
+			"db": 0-15 /* Database index, standalone mode only (cluster mode forces 0) */
+		},
 	}
 }
 ```