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

.github/workflows/build.yml

@@ -31,14 +31,14 @@ jobs:
     - name: selftest
       run: |
         make selftest
-        ./zerotier-selftest
+        ./backone-selftest
     - name: 'Tar files' # keeps permissions (execute)
-      run: tar -cvf zerotier-one.tar zerotier-one
+      run: tar -cvf backone.tar backone
     - name: Archive production artifacts
       uses: actions/upload-artifact@v4
       with:
-        name: zerotier-one-ubuntu-x64
-        path: zerotier-one.tar
+        name: backone-ubuntu-x64
+        path: backone.tar
         retention-days: 7
 
   build_macos:
@@ -75,14 +75,14 @@ jobs:
     - name: selftest
       run: |
         make selftest
-        ./zerotier-selftest
+        ./backone-selftest
     - name: 'Tar files' # keeps permissions (execute)
-      run: tar -cvf zerotier-one.tar zerotier-one
+      run: tar -cvf backone.tar backone
     - name: Archive production artifacts
       uses: actions/upload-artifact@v4
       with:
-        name: zerotier-one-mac
-        path: zerotier-one.tar
+        name: backone-mac
+        path: backone.tar
         retention-days: 7
 
 
@@ -118,6 +118,6 @@ jobs:
     - name: Archive production artifacts
       uses: actions/upload-artifact@v4
       with:
-        name: zerotier-one-windows
+        name: backone-windows
         path: windows/Build
         retention-days: 7