ci(doc-linter): scope to docs/ only — skip repo-root meta files

The linter targets published documentation sources; the auto-discover
fallback already walks `docs/` only. CI was passing root-level meta
files (README.md, AGENTS.md, .github/copilot-instructions.md — the
last is a symlink to AGENTS.md) which forced docs-publication
conventions (80-char wrap, RFC IP rules, suppression markers) onto
project meta that has no business obeying them.

Add an `is_docs_path()` guard in `main()` so the explicit-file-list
path matches the auto-discover behavior — only files under `docs/`
are linted. AGENTS.md and the Copilot-instruction symlink are now
out of scope.

Verified:
- `python3 scripts/doc-linter.py "['AGENTS.md', 'README.md', '.github/copilot-instructions.md']"` → exit 0 (all skipped).
- `python3 scripts/doc-linter.py "['docs/_test_lint.md']"` with a real public IP → still errors as expected.

🤖 Generated by [robots](https://vyos.io)

1 files changed, 15 insertions, 1 deletions

diff --git a/scripts/doc-linter.py b/scripts/doc-linter.py
index 5ccff488..c86ff29a 100644
--- a/scripts/doc-linter.py
+++ b/scripts/doc-linter.py
@@ -29,6 +29,16 @@ NUMBER = r"([\s']\d+[\s'])"
 
 SUPPORTED_EXTS = ('.md', '.rst', '.txt')
 
+# Linter only applies to published documentation sources under docs/. Repo-root
+# files (README.md, AGENTS.md, .github/copilot-instructions.md) are project
+# meta, not docs content, and are out of scope.
+DOCS_ROOT = 'docs' + os.sep
+
+
+def is_docs_path(path):
+    norm = os.path.normpath(path)
+    return norm == 'docs' or norm.startswith(DOCS_ROOT)
+
 # MyST / Markdown fenced code block: leading whitespace + 3+ backticks or 3+ colons.
 # Same character and length-or-greater closes.
 MD_FENCE_RE = re.compile(r'^(\s*)(`{3,}|:{3,})(.*)$')
@@ -220,7 +230,11 @@ def main():
     try:
         files = ast.literal_eval(sys.argv[1])
         for file in files:
-                if file.endswith(SUPPORTED_EXTS) and "_build" not in file:
+                if (
+                    file.endswith(SUPPORTED_EXTS)
+                    and "_build" not in file
+                    and is_docs_path(file)
+                ):
                     if handle_file_action(file) is False:
                         bool_error = False
     except Exception as e: