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.

cookie_warmer.py

@@ -27,16 +27,29 @@ WARMER_DIR.mkdir(parents=True, exist_ok=True)
 
 # Realistic pages to "warm" cookies against (these are common referrers/browsing paths)
 WARMING_PAGES = {
-    "amazon": ["https://www.amazon.com/", "https://www.amazon.com/gp/help/customer/contact-us",
-               "https://www.amazon.com/privacy", "https://www.amazon.com/conditions-of-use"],
-    "ebay": ["https://www.ebay.com/", "https://www.ebay.com/help/home",
-             "https://www.ebay.com/myp/PurchaseHistory"],
+    "amazon": [
+        "https://www.amazon.com/",
+        "https://www.amazon.com/gp/help/customer/contact-us",
+        "https://www.amazon.com/privacy",
+        "https://www.amazon.com/conditions-of-use",
+    ],
+    "ebay": [
+        "https://www.ebay.com/",
+        "https://www.ebay.com/help/home",
+        "https://www.ebay.com/myp/PurchaseHistory",
+    ],
     "shopify": ["https://www.shopify.com/", "https://www.shopify.com/pricing"],
-    "twitter": ["https://twitter.com/", "https://twitter.com/explore",
-                "https://twitter.com/settings/account"],
+    "twitter": [
+        "https://twitter.com/",
+        "https://twitter.com/explore",
+        "https://twitter.com/settings/account",
+    ],
     "linkedin": ["https://www.linkedin.com/", "https://www.linkedin.com/help/intro"],
-    "generic": ["https://www.google.com/", "https://en.wikipedia.org/wiki/Main_Page",
-                "https://github.com/"],
+    "generic": [
+        "https://www.google.com/",
+        "https://en.wikipedia.org/wiki/Main_Page",
+        "https://github.com/",
+    ],
 }