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/google_meet/__init__.py

@@ -72,7 +72,7 @@ def register(ctx) -> None:
     # tested path there and guest-join Chromium is flakier. Refuse to register
     # rather than half-working.
     system = platform.system().lower()
-    if system not in ("linux", "darwin"):
+    if system not in {"linux", "darwin"}:
         logger.info(
             "google_meet plugin: platform=%s not supported (linux/macos only)",
             system,

plugins/google_meet/cli.py

@@ -159,7 +159,7 @@ def _cmd_setup() -> int:
     print("---------------------")
 
     system = _p.system()
-    system_ok = system in ("Linux", "Darwin")
+    system_ok = system in {"Linux", "Darwin"}
     print(f"  platform       : {system}  [{'ok' if system_ok else 'unsupported'}]")
 
     try:
@@ -231,7 +231,7 @@ def _cmd_install(*, realtime: bool, assume_yes: bool) -> int:
     import subprocess as _sp
 
     system = _p.system()
-    if system not in ("Linux", "Darwin"):
+    if system not in {"Linux", "Darwin"}:
         print(f"google_meet install: {system} is not supported (linux/macos only)")
         return 1
 
@@ -242,7 +242,7 @@ def _cmd_install(*, realtime: bool, assume_yes: bool) -> int:
             ans = input(f"{prompt} [y/N] ").strip().lower()
         except EOFError:
             return False
-        return ans in ("y", "yes")
+        return ans in {"y", "yes"}
 
     print("google_meet install")
     print("-------------------")

plugins/google_meet/meet_bot.py

@@ -447,7 +447,7 @@ def _mac_audio_device_index(device_name: str) -> str:
 def run_bot() -> int:  # noqa: C901 — orchestration, explicit branches
     url = os.environ.get("HERMES_MEET_URL", "").strip()
     out_dir_env = os.environ.get("HERMES_MEET_OUT_DIR", "").strip()
-    headed = os.environ.get("HERMES_MEET_HEADED", "").lower() in ("1", "true", "yes")
+    headed = os.environ.get("HERMES_MEET_HEADED", "").lower() in {"1", "true", "yes"}
     auth_state = os.environ.get("HERMES_MEET_AUTH_STATE", "").strip()
     guest_name = os.environ.get("HERMES_MEET_GUEST_NAME", "Hermes Agent")
     duration_s = _parse_duration(os.environ.get("HERMES_MEET_DURATION", ""))
@@ -808,7 +808,7 @@ def _looks_like_human_speaker(speaker: str, bot_guest_name: str) -> bool:
     if not speaker or not speaker.strip():
         return False
     spk = speaker.strip().lower()
-    if spk in ("unknown", "you", bot_guest_name.strip().lower()):
+    if spk in {"unknown", "you", bot_guest_name.strip().lower()}:
         return False
     return True
 

plugins/google_meet/node/cli.py

@@ -103,7 +103,7 @@ def node_command(args: argparse.Namespace) -> int:
         print(f"removed {args.name!r}" if ok else f"no such node: {args.name!r}")
         return 0 if ok else 1
 
-    if cmd in ("status", "ping"):
+    if cmd in {"status", "ping"}:
         entry = reg.get(args.name)
         if entry is None:
             print(f"no such node: {args.name!r}", file=sys.stderr)

plugins/google_meet/realtime/openai_client.py

@@ -183,7 +183,7 @@ class RealtimeSession:
                     rid = (frame.get("response") or {}).get("id")
                     if rid:
                         self._last_response_id = rid
-                elif ftype in ("response.done", "response.completed", "response.cancelled"):
+                elif ftype in {"response.done", "response.completed", "response.cancelled"}:
                     break
                 elif ftype == "error":
                     err = frame.get("error") or frame

plugins/google_meet/tools.py

@@ -36,7 +36,7 @@ def check_meet_requirements() -> bool:
     handlers relax the requirement when a node is addressed.
     """
     import platform as _p
-    if _p.system().lower() not in ("linux", "darwin"):
+    if _p.system().lower() not in {"linux", "darwin"}:
         return False
     try:
         import playwright  # noqa: F401
@@ -238,7 +238,7 @@ def handle_meet_join(args: Dict[str, Any], **_kw) -> str:
     if not url:
         return _err("url is required")
     mode = (args.get("mode") or "transcribe").strip().lower()
-    if mode not in ("transcribe", "realtime"):
+    if mode not in {"transcribe", "realtime"}:
         return _err(f"mode must be 'transcribe' or 'realtime' (got {mode!r})")
 
     node = args.get("node")