chore: ruff auto-fix PLR6201 resweep — tuple → set in membership tests (#27355)

Six days after #23937 (608 fixes) the codebase had accumulated 241 new
PLR6201 violations. Same mechanical `x in (...)` → `x in {...}` fix,
same zero-risk profile: set lookup is O(1) vs O(n) for tuple and the
two are semantically equivalent for hashable scalar membership tests.

All 241 instances fixed via `ruff check --select PLR6201 --fix
--unsafe-fixes`, zero remaining. Every changed value is a hashable
scalar (str/int/None/enum/signal); no risk of unhashable runtime
errors. No behavior change.

Test plan:
- 119 files changed, +244/-244 (net zero) — exactly one-line edits
- `ruff check` clean afterward
- Compile checks pass on the largest touched files (cli.py, run_agent.py,
  gateway/run.py, gateway/platforms/discord.py, model_tools.py)
- Subset broad test run on tests/gateway/ tests/hermes_cli/ tests/agent/
  tests/tools/: 18187 passed, 59 pre-existing failures (verified against
  origin/main with the same shape — identical failure count, identical
  category — all xdist test-order flakes unrelated to this change)

Follows the same template as PR #23937 ([tracker: #23972](https://github.com/NousResearch/hermes-agent/issues/23972)).

plugins/model-providers/deepseek/__init__.py

@@ -74,9 +74,9 @@ class DeepSeekProfile(ProviderProfile):
         # its server default (currently high).
         if isinstance(reasoning_config, dict):
             effort = (reasoning_config.get("effort") or "").strip().lower()
-            if effort in ("xhigh", "max"):
+            if effort in {"xhigh", "max"}:
                 top_level["reasoning_effort"] = "max"
-            elif effort in ("low", "medium", "high"):
+            elif effort in {"low", "medium", "high"}:
                 top_level["reasoning_effort"] = effort
 
         return extra_body, top_level