fix(state): let sqlite raise the canonical error for a directory db_path

The owner-only pre-create helper ran before sqlite3.connect() and turned
a directory-as-state.db misconfiguration into IsADirectoryError instead
of the sqlite OperationalError the open path (and its lock-patience
classifier) expects. A directory leaks no row data, so skip it and let
sqlite fail canonically. Also map the salvage carry-commit author email
for the attribution gate.

contributors/emails/hermes-fleet-fix@localhost

@@ -0,0 +1 @@
+rohitsabu

hermes_state.py

@@ -248,6 +248,10 @@ def _secure_state_db_files(db_path: Path, *, create_main: bool = False) -> None:
             fd = os.open(path, flags, 0o600)
         except FileNotFoundError:
             continue
+        except IsADirectoryError:
+            # Not a database file at all; sqlite3.connect() raises the
+            # canonical error for this, and a directory leaks no row data.
+            continue
         try:
             os.fchmod(fd, 0o600)
         finally: