fix(send_message): pass photon DM chat GUIDs through as explicit targets

'photon:any;-;+1555...' targets matched no parser pattern, so
_handle_send bounced them off the channel directory and failed
resolution even though the adapter accepts the GUID verbatim (the
react handler already passed them through). Recognize the DM chat
GUID shape (mirrors the adapter's _DM_CHAT_GUID_RE) in
_parse_target_ref for photon only.

tests/tools/test_send_message_target_parse.py

@@ -29,6 +29,23 @@ def test_e164_target_still_requires_phone_platform() -> None:
     assert _parse_target_ref("matrix", "+15551234567")[2] is False
 
 
+def test_photon_dm_chat_guid_is_explicit() -> None:
+    # 'any;-;+1555...' is the platform-native DM space GUID inbound events
+    # carry — it must pass through verbatim instead of bouncing off the
+    # channel directory (issue #69960's secondary target-resolution bug).
+    chat_id, thread_id, is_explicit = _parse_target_ref(
+        "photon", "any;-;+15551234567"
+    )
+
+    assert chat_id == "any;-;+15551234567"
+    assert thread_id is None
+    assert is_explicit is True
+
+
+def test_photon_dm_chat_guid_only_matches_photon() -> None:
+    assert _parse_target_ref("signal", "any;-;+15551234567")[2] is False
+
+
 def test_whatsapp_group_jid_target_is_explicit() -> None:
     chat_id, thread_id, is_explicit = _parse_target_ref(
         "whatsapp", "120363408391911677@g.us"

tools/send_message_tool.py

@@ -44,6 +44,8 @@ _NUMERIC_TOPIC_RE = _TELEGRAM_TOPIC_TARGET_RE
 # downstream adapters (signal, etc.) expect.
 _PHONE_PLATFORMS = frozenset({"photon", "signal", "sms", "whatsapp"})
 _E164_TARGET_RE = re.compile(r"^\s*\+(\d{7,15})\s*$")
+# Photon DM chat GUID (mirrors _DM_CHAT_GUID_RE in the photon adapter).
+_PHOTON_DM_GUID_RE = re.compile(r"^any;-;\+\d{6,}$")
 # WhatsApp JIDs: group chats (<digits>@g.us), individual users
 # (<phone>@s.whatsapp.net), linked identities (<id>@lid), and broadcast /
 # newsletter chats. These are explicit native targets the bridge accepts
@@ -603,6 +605,12 @@ def _parse_target_ref(platform_name: str, target_ref: str):
             # Preserve the leading '+' — signal-cli and sms/whatsapp adapters
             # expect E.164 format for direct recipients.
             return target_ref.strip(), None, True
+    if platform_name == "photon":
+        # Photon DM chat GUIDs ('any;-;+1555...') are platform-native ids the
+        # adapter resolves itself — pass through verbatim instead of bouncing
+        # them off the channel directory (mirrors the react handler).
+        if _PHOTON_DM_GUID_RE.fullmatch(target_ref.strip()):
+            return target_ref.strip(), None, True
     if target_ref.lstrip("-").isdigit():
         return target_ref, None, True
     # Matrix room IDs (start with !) and user IDs (start with @) are explicit