ci: add AGPL license bot (amend added files + PR comment)

.licenseignore

@@ -0,0 +1,30 @@
+# addlicense ignore patterns (doublestar globs, relative to the repo root).
+# Blank lines and lines starting with '#' are skipped. addlicense validates every
+# pattern and skips file types it does not understand on its own, so this file is
+# only the escape hatch for files that must not carry an AGPL header.
+
+# generated / vendored / build output
+**/node_modules/**
+**/vendor/**
+**/tmp/**
+**/dist/**
+**/build/**
+
+# non-code and config files
+**/*.md
+**/*.json
+**/*.yaml
+**/*.yml
+**/*.toml
+**/*.lock
+**/*.sum
+**/*.mod
+**/*.log
+**/*.txt
+**/*.debug
+
+# repo plumbing
+.licenseignore
+.gitignore
+.gitmodules
+.vscode/**