fix #651: hook-check exits silently instead of emitting unsupported additionalContext

Codex Desktop rejects hookSpecificOutput.additionalContext on PreToolUse.
hook-check is now a no-op — graph guidance reaches the agent via AGENTS.md/skill.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

graphify/__main__.py

@@ -1510,23 +1510,9 @@ def main() -> None:
             sys.exit(1)
 
     elif cmd == "hook-check":
-        # Shell-agnostic PreToolUse hook entry point for Codex (and any platform
-        # where embedding Python/bash inline in a JSON hook command is fragile).
-        # Prints the hookSpecificOutput JSON if graph.json exists, exits 0 silently
-        # if not. Works on Windows PowerShell, cmd.exe, macOS, and Linux.
-        graph = Path("graphify-out") / "graph.json"
-        if graph.exists():
-            import json as _json
-            print(_json.dumps({
-                "hookSpecificOutput": {
-                    "hookEventName": "PreToolUse",
-                    "additionalContext": (
-                        "graphify: Knowledge graph exists. "
-                        "Read graphify-out/GRAPH_REPORT.md for god nodes and "
-                        "community structure before searching raw files."
-                    ),
-                }
-            }))
+        # Codex Desktop rejects hookSpecificOutput.additionalContext on PreToolUse.
+        # Keep this as a cross-platform no-op so installed hooks never break Bash
+        # tool calls. Graph guidance reaches the agent via AGENTS.md / skill instead.
         sys.exit(0)
     elif cmd == "check-update":
         if len(sys.argv) < 3: