fix: verify success completion signal + cross-session verify_url restore

_on_verify_success() was missing _nickserv_complete() call, causing
_go_ready() to hang at _nickserv_done.wait() when registration
completed immediately (no email verification needed).

get_pending_registration() was not returning verify_url from the DB,
so _resume_pending_verification() never restored self._verify_url --
breaking cross-session captcha resume for OFTC-style networks.

Four regression tests added.

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

tests/test_network.py

@@ -1058,6 +1058,35 @@ class TestHandleNickserv:
         assert net._nickserv_pending == ""
         bl.mark_nickserv_verified.assert_awaited_once()
 
+    @pytest.mark.asyncio
+    async def test_verify_success_signals_completion(self) -> None:
+        """_on_verify_success must signal _nickserv_done."""
+        bl = _mock_backlog()
+        net = _net(backlog=bl)
+        net.nick = "verified_nick"
+        net._nickserv_pending = "verify"
+        net._nickserv_password = "pass"
+        net._nickserv_done = asyncio.Event()
+
+        await net._handle_nickserv("verified_nick has been verified")
+        assert net._nickserv_pending == ""
+        assert net._nickserv_done.is_set()
+
+    @pytest.mark.asyncio
+    async def test_registration_immediate_signals_completion(self) -> None:
+        """Immediate registration (no email) must signal _nickserv_done."""
+        bl = _mock_backlog()
+        net = _net(backlog=bl)
+        net.nick = "fastnick"
+        net._nickserv_pending = "register"
+        net._nickserv_password = "pass"
+        net._nickserv_done = asyncio.Event()
+
+        await net._handle_nickserv("Nickname registered under your account")
+        assert net._nickserv_pending == ""
+        assert net._nickserv_done.is_set()
+        bl.mark_nickserv_verified.assert_awaited_once()
+
     @pytest.mark.asyncio
     async def test_verify_failure(self) -> None:
         net = _net()
@@ -1068,6 +1097,46 @@ class TestHandleNickserv:
         await net._handle_nickserv("Invalid verification code")
         assert net._nickserv_pending == ""
 
+    @pytest.mark.asyncio
+    async def test_resume_pending_restores_verify_url(self) -> None:
+        """Cross-session resume must restore the verify_url from DB."""
+        bl = _mock_backlog(
+            pending=("oldnick", "pass", "e@mail.tm", "host", "https://oftc/verify/abc"),
+        )
+        net = _net(backlog=bl)
+        net.state = State.READY
+        net._running = True
+        net.nick = "oldnick"
+        writer = MagicMock()
+        writer.is_closing.return_value = False
+        writer.drain = AsyncMock()
+        net._writer = writer
+
+        result = await net._resume_pending_verification()
+        assert result is True
+        assert net._verify_url == "https://oftc/verify/abc"
+        assert net._nickserv_email == "e@mail.tm"
+        assert net._nickserv_password == "pass"
+
+    @pytest.mark.asyncio
+    async def test_resume_pending_no_url(self) -> None:
+        """Resume works when verify_url is empty."""
+        bl = _mock_backlog(
+            pending=("nick", "pass", "e@mail.tm", "host", ""),
+        )
+        net = _net(backlog=bl)
+        net.state = State.READY
+        net._running = True
+        net.nick = "nick"
+        writer = MagicMock()
+        writer.is_closing.return_value = False
+        writer.drain = AsyncMock()
+        net._writer = writer
+
+        result = await net._resume_pending_verification()
+        assert result is True
+        assert net._verify_url == ""
+
     @pytest.mark.asyncio
     async def test_late_registration_confirmation(self) -> None:
         """After timeout clears pending state, late confirmation still works."""