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/platforms/simplex/adapter.py

@@ -101,11 +101,11 @@ def _guess_extension(data: bytes) -> str:
 
 
 def _is_image_ext(ext: str) -> bool:
-    return ext.lower() in (".jpg", ".jpeg", ".png", ".gif", ".webp")
+    return ext.lower() in {".jpg", ".jpeg", ".png", ".gif", ".webp"}
 
 
 def _is_audio_ext(ext: str) -> bool:
-    return ext.lower() in (".mp3", ".wav", ".ogg", ".m4a", ".aac")
+    return ext.lower() in {".mp3", ".wav", ".ogg", ".m4a", ".aac"}
 
 
 # ---------------------------------------------------------------------------
@@ -326,12 +326,12 @@ class SimplexAdapter(BasePlatformAdapter):
         # Filter out messages sent by us (direction == "snd")
         meta = chat_item.get("meta") or {}
         direction = (meta.get("itemStatus") or {}).get("type", "")
-        if direction in ("sndSent", "sndSentDirect", "sndSentViaProxy", "sndNew"):
+        if direction in {"sndSent", "sndSentDirect", "sndSentViaProxy", "sndNew"}:
             return
 
         # Determine chat type and IDs
         chat_type_raw = chat_info.get("type", "")
-        is_group = chat_type_raw in ("group", "groupInfo")
+        is_group = chat_type_raw in {"group", "groupInfo"}
 
         if is_group:
             group_info = chat_info.get("groupInfo") or chat_info.get("group") or {}
@@ -374,7 +374,7 @@ class SimplexAdapter(BasePlatformAdapter):
         media_urls: List[str] = []
         media_types: List[str] = []
         file_info = chat_item.get("file") or {}
-        if file_info and file_info.get("fileStatus") not in ("cancelled", "error"):
+        if file_info and file_info.get("fileStatus") not in {"cancelled", "error"}:
             file_id = file_info.get("fileId")
             file_name = file_info.get("fileName", "file")
             if file_id: