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/memory/hindsight/__init__.py

@@ -416,7 +416,7 @@ def _build_embedded_profile_env(config: dict[str, Any], *, llm_api_key: str | No
     current_base_url = config.get("llm_base_url") or os.environ.get("HINDSIGHT_API_LLM_BASE_URL", "")
 
     # The embedded daemon expects OpenAI wire format for these providers.
-    daemon_provider = "openai" if current_provider in ("openai_compatible", "openrouter") else current_provider
+    daemon_provider = "openai" if current_provider in {"openai_compatible", "openrouter"} else current_provider
 
     env_values = {
         "HINDSIGHT_API_LLM_PROVIDER": str(daemon_provider),
@@ -596,7 +596,7 @@ class HindsightMemoryProvider(MemoryProvider):
         try:
             cfg = _load_config()
             mode = cfg.get("mode", "cloud")
-            if mode in ("local", "local_embedded"):
+            if mode in {"local", "local_embedded"}:
                 available, _ = _check_local_runtime()
                 return available
             if mode == "local_external":
@@ -888,7 +888,7 @@ class HindsightMemoryProvider(MemoryProvider):
                 from hindsight import HindsightEmbedded
                 HindsightEmbedded.__del__ = lambda self: None
                 llm_provider = self._config.get("llm_provider", "")
-                if llm_provider in ("openai_compatible", "openrouter"):
+                if llm_provider in {"openai_compatible", "openrouter"}:
                     llm_provider = "openai"
                 logger.debug("Creating HindsightEmbedded client (profile=%s, provider=%s)",
                              self._config.get("profile", "hermes"), llm_provider)
@@ -1132,7 +1132,7 @@ class HindsightMemoryProvider(MemoryProvider):
                 self._mode = "disabled"
                 return
         self._api_key = self._config.get("apiKey") or self._config.get("api_key") or os.environ.get("HINDSIGHT_API_KEY", "")
-        default_url = _DEFAULT_LOCAL_URL if self._mode in ("local_embedded", "local_external") else _DEFAULT_API_URL
+        default_url = _DEFAULT_LOCAL_URL if self._mode in {"local_embedded", "local_external"} else _DEFAULT_API_URL
         self._api_url = self._config.get("api_url") or os.environ.get("HINDSIGHT_API_URL", default_url)
         self._llm_base_url = self._config.get("llm_base_url", "")
 
@@ -1152,10 +1152,10 @@ class HindsightMemoryProvider(MemoryProvider):
         self._budget = budget if budget in _VALID_BUDGETS else "mid"
 
         memory_mode = self._config.get("memory_mode", "hybrid")
-        self._memory_mode = memory_mode if memory_mode in ("context", "tools", "hybrid") else "hybrid"
+        self._memory_mode = memory_mode if memory_mode in {"context", "tools", "hybrid"} else "hybrid"
 
         prefetch_method = self._config.get("recall_prefetch_method") or self._config.get("prefetch_method", "recall")
-        self._prefetch_method = prefetch_method if prefetch_method in ("recall", "reflect") else "recall"
+        self._prefetch_method = prefetch_method if prefetch_method in {"recall", "reflect"} else "recall"
 
         # Bank options
         self._bank_mission = self._config.get("bank_mission", "")