test(chat-completions): cover timestamp strip + add AUTHOR_MAP entry

Add a regression test for #47868 asserting convert_messages strips the
internal per-message timestamp field, plus the identity-return path for
timestamp-free message lists. Map x7peeps for the release attribution gate.

scripts/release.py

@@ -46,6 +46,7 @@ ACP_REGISTRY_MANIFEST = REPO_ROOT / "acp_registry" / "agent.json"
 # Auto-extracted from noreply emails + manual overrides
 AUTHOR_MAP = {
     "w31rdm4ch1n3z@protonmail.com": "w31rdm4ch1nZ",
+    "xtpeeps@gmail.com": "x7peeps",
     "rratmansky@gmail.com": "rratmansky",
     "lkz-de@users.noreply.github.com": "lkz-de",
     "charles@salesondemand.io": "salesondemandio",

tests/agent/transports/test_chat_completions.py

@@ -104,6 +104,31 @@ class TestChatCompletionsBasic:
         # Original list untouched (deepcopy-on-demand)
         assert msgs[2]["tool_name"] == "execute_code"
 
+    def test_convert_messages_strips_timestamp(self, transport):
+        """Internal per-message ``timestamp`` metadata (stamped by
+        ``_apply_persist_user_message_override`` to preserve platform event
+        time without embedding it in content, and persisted to the SQLite
+        store) is not part of the OpenAI Chat Completions schema. Strict
+        providers like Mistral / Fireworks-backed endpoints reject it with
+        HTTP 422 'Extra inputs are not permitted, field: messages[N].timestamp'.
+        Regression test for #47868.
+        """
+        msgs = [
+            {"role": "user", "content": "hi", "timestamp": 1781976577.0},
+        ]
+        result = transport.convert_messages(msgs)
+        assert "timestamp" not in result[0]
+        assert result[0]["content"] == "hi"
+        assert result[0]["role"] == "user"
+        # Original list untouched (deepcopy-on-demand)
+        assert msgs[0]["timestamp"] == 1781976577.0
+
+    def test_convert_messages_no_copy_without_timestamp(self, transport):
+        """A timestamp-free message list needs no sanitize pass and is
+        returned by identity (preserves the deepcopy-on-demand contract)."""
+        msgs = [{"role": "user", "content": "hi"}]
+        assert transport.convert_messages(msgs) is msgs
+
     def test_convert_messages_strips_internal_scaffolding_markers(self, transport):
         """Hermes-internal ``_``-prefixed markers must never reach the wire.