chore(lint-cleanup): remove 10 pre-existing ruff issues in 4 test files

Cleans up unused imports and dead locals flagged by ruff in the test
files PR #50 (M-b) touched. Tests-only; no production code, no service
restart.

- test_supervisor_hotreload.py: drop unused AsyncMock/patch imports,
  dead expected_wait/expected_next_poll locals, and two dead
  state = AdapterState(...) blocks plus their now-orphaned local imports
- test_supervisor_integration.py: drop unused asyncio/patch/pytest_asyncio
  imports and AdapterState from two function-local imports

ruff tests/ 92 -> 82 (the 4 named files now 0; all other files unchanged).
Full suite: 590 passed, 1 skipped (central and unprivileged zvx).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_supervisor_hotreload.py

@@ -5,7 +5,7 @@ import base64
 import os
 from datetime import datetime, timedelta, timezone
 from pathlib import Path
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import MagicMock
 
 import asyncpg
 import pytest
@@ -206,10 +206,7 @@ class TestRateLimitGuarantee:
         state.config = new_config
         state.adapter.cadence_s = 90
 
-        # Calculate expected next poll time
-        expected_next_poll = last_poll + timedelta(seconds=90)
         now = datetime.now(timezone.utc)
-        expected_wait = max(0, (expected_next_poll - now).total_seconds())
 
         # The wait time should be based on last_poll + new_cadence
         # Since last_poll was 30 seconds ago and new cadence is 90,
@@ -230,7 +227,6 @@ class TestRateLimitGuarantee:
         If operator increases cadence to 120s after a gap of 150s,
         the poll should happen now (not wait another 120s).
         """
-        from central.supervisor import AdapterState
 
         mock_adapter = MagicMock()
         mock_adapter.name = "test"
@@ -248,13 +244,6 @@ class TestRateLimitGuarantee:
             updated_at=datetime.now(timezone.utc),
         )
 
-        state = AdapterState(
-            name="test",
-            adapter=mock_adapter,
-            config=config,
-            last_completed_poll=last_poll,
-        )
-
         # Calculate next poll time
         now = datetime.now(timezone.utc)
         next_poll_at = last_poll.timestamp() + config.cadence_s
@@ -274,7 +263,6 @@ class TestRateLimitGuarantee:
         poll should be at (last_completed_poll + cadence_s), not immediately
         (unless that time has already passed).
         """
-        from central.supervisor import AdapterState
 
         mock_adapter = MagicMock()
         mock_adapter.name = "test"
@@ -293,13 +281,6 @@ class TestRateLimitGuarantee:
             updated_at=datetime.now(timezone.utc),
         )
 
-        state = AdapterState(
-            name="test",
-            adapter=mock_adapter,
-            config=config,
-            last_completed_poll=last_poll,
-        )
-
         # Calculate next poll time
         now = datetime.now(timezone.utc)
         next_poll_at = last_poll.timestamp() + config.cadence_s