chore(wolf): checkpoint buglog.json (1057 bugs)

.wolf/buglog.json

@@ -19542,6 +19542,27 @@
       ],
       "occurrences": 1,
       "last_seen": "2026-08-26T20:15:00Z"
+    },
+    {
+      "id": "bug-1716",
+      "timestamp": "2026-08-26T14:25:00Z",
+      "error_message": "test_rcfile_load_directory_path_warns_and_returns_0:FAIL: Expected TRUE Was FALSE (stderr capture was empty -- no warning printed) when rcfile_load() opened a directory path",
+      "file": "src/controller/testsuite/rcfile.c",
+      "root_cause": "On this platform (glibc/Linux), fopen(path, \"r\") SUCCEEDS for a directory path -- it does not return NULL/set errno the way the design doc's error-handling section (and a naive reading of 'the file could not be opened for another reason') implied. The open failure only surfaces on the FIRST READ: getline() returns -1 with errno==EISDIR and ferror(f) set (feof(f) stays 0). rcfile_load()'s original implementation only checked `if (!f)` right after fopen() and had no post-loop check on the stream's error state, so a directory path silently produced rc=0 with zero lines processed and NO warning ever printed -- functionally 'safe' (no crash, no runner call) but silently violating the design's documented 'present but unreadable: print one stderr warning' contract for exactly this case.",
+      "fix": "Added a check after the getline() loop in rcfile_load(): `if (rc == 0 && ferror(f)) { fprintf(stderr, ...); }` -- prints the same warning message used for the fopen()-failure branch, keyed off ferror(f) rather than assuming the failure is only detectable at fopen() time. Confirmed live via a small standalone C repro (fopen(\"/tmp\",\"r\") then fread/getline) that fopen() returns a valid FILE* for a directory and the read call is what fails with EISDIR + ferror set.",
+      "tags": [
+        "rcfile",
+        "fopen",
+        "EISDIR",
+        "directory",
+        "getline",
+        "xce-test-rc-file",
+        "controller-testsuite",
+        "stderr-warning"
+      ],
+      "related_bugs": [],
+      "occurrences": 1,
+      "last_seen": "2026-08-26T14:25:00Z"
     }
   ]
 }