github: add quota()probe

src/devnet/sources/github.py

@@ -1,6 +1,8 @@
 """GitHub public data. Anonymous works (60 req/hr per Space IP); GITHUB_TOKEN raises it."""
 from __future__ import annotations
 
+import os
+
 from ..core import Resource, UpstreamError, get, strip_html
 
 API = "https://api.github.com"
@@ -105,4 +107,25 @@ def issues(owner: str, name: str, state: str = "open", limit: int = 20) -> dict:
         "count": len(items),
         "pull_requests_filtered": filtered_prs,
         "items": items,
+    }
+
+
+def quota() -> dict:
+    """Report GitHub's current rate-limit bucket. 60/hr without a token."""
+    configured = bool(os.environ.get("GITHUB_TOKEN", "").strip())
+    try:
+        payload = get(f"{API}/rate_limit", ttl=60)
+    except UpstreamError as exc:
+        return {
+            "configured": configured,
+            "usable": False,
+            "error": str(exc)[:160],
+        }
+    core = (payload.get("resources") or {}).get("core") or {}
+    return {
+        "configured": configured,
+        "usable": True,
+        "limit": core.get("limit"),
+        "remaining": core.get("remaining"),
+        "reset_at": core.get("reset"),
     }