chore(lint): auto-fix 253 of 283 ruff issues (F401, I001, E402, RUF100, UP037, SIM105)

Mass ruff auto-fix:
  - ruff check --fix: 109 issues fixed (F401 unused imports,
    I001 unsorted imports, UP037 quoted annotations, SIM105
    suppressible exception, RUF100 unused-noqa)
  - ruff check --fix --unsafe-fixes: 22 additional issues
  - ruff format: 70 files reformatted
  - Manual pass: fix 16 misplaced import httpx lines
  - Manual pass: fix remaining E402 (import-after-docstring)

Result: 283 errors -> 30 errors.

The remaining 30 are real issues that need manual review:
  5 F401 unused-import (likely auto-generated stubs)
  5 F821 undefined-name (real bugs in code that references
    redis/pydantic/LLMRegistry without imports)
  3 BLE001 (the compliance LLM fallback is intentional; the
    other two are real)
  3 RUF012 mutable-class-default
  3 SIM105, 3 SIM117, 2 E722, 2 E741
  1 B007, 1 B025, 1 E402, 1 RUF200 (pyproject.toml issue)

Tests: 436/437 pass (1 pre-existing SSE sandbox failure).
format check + import sort: now clean.
make ci: still gated on the 30 remaining real issues.
Follow-up: triage the 30 issues file-by-file.

websocket_scraper.py

@@ -56,10 +56,7 @@ class WebSocketScraper:
                 subprotocols=protocols,
             ) as ws:
                 start = time.time()
-                while (
-                    len(messages) < self.max_messages
-                    and (time.time() - start) < self.timeout
-                ):
+                while len(messages) < self.max_messages and (time.time() - start) < self.timeout:
                     try:
                         msg = await asyncio.wait_for(ws.recv(), timeout=2)
                     except TimeoutError:
@@ -72,9 +69,7 @@ class WebSocketScraper:
                         parsed: Any = json.loads(msg)
                     except (json.JSONDecodeError, ValueError):
                         parsed = msg
-                    messages.append(
-                        {"data": parsed, "raw": msg, "received_at": time.time()}
-                    )
+                    messages.append({"data": parsed, "raw": msg, "received_at": time.time()})
         except (json.JSONDecodeError, ValueError) as e:
             return {"success": False, "error": str(e)[:300]}