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/irc/adapter.py

@@ -112,7 +112,7 @@ class IRCAdapter(BasePlatformAdapter):
         self.nickname = os.getenv("IRC_NICKNAME") or extra.get("nickname", "hermes-bot")
         self.channel = os.getenv("IRC_CHANNEL") or extra.get("channel", "")
         self.use_tls = (
-            os.getenv("IRC_USE_TLS", "").lower() in ("1", "true", "yes")
+            os.getenv("IRC_USE_TLS", "").lower() in {"1", "true", "yes"}
             if os.getenv("IRC_USE_TLS")
             else extra.get("use_tls", True)
         )
@@ -680,7 +680,7 @@ def _env_enablement() -> dict | None:
         seed["nickname"] = nickname
     use_tls = os.getenv("IRC_USE_TLS", "").strip().lower()
     if use_tls:
-        seed["use_tls"] = use_tls in ("1", "true", "yes")
+        seed["use_tls"] = use_tls in {"1", "true", "yes"}
     # Passwords live in PlatformConfig.extra as well for back-compat with
     # existing config.yaml users; env-reads at construct time still win.
     if os.getenv("IRC_SERVER_PASSWORD"):
@@ -756,7 +756,7 @@ async def _standalone_send(
     nickname = os.getenv("IRC_NICKNAME") or extra.get("nickname", "hermes-bot")
     use_tls_env = os.getenv("IRC_USE_TLS")
     if use_tls_env is not None:
-        use_tls = use_tls_env.lower() in ("1", "true", "yes")
+        use_tls = use_tls_env.lower() in {"1", "true", "yes"}
     else:
         use_tls = bool(extra.get("use_tls", True))
 
@@ -821,7 +821,7 @@ async def _standalone_send(
                 await _raw(f"PONG :{payload}")
             elif cmd == "001":
                 registered = True
-            elif cmd in ("432", "433"):
+            elif cmd in {"432", "433"}:
                 nick_attempts += 1
                 if nick_attempts > max_nick_attempts:
                     return {"error": "IRC standalone send: too many nick collisions"}
@@ -829,7 +829,7 @@ async def _standalone_send(
                 # mutated value, so the suffix stays bounded.
                 standalone_nick = f"{nick_base}-cron-{nick_attempts}"[:30]
                 await _raw(f"NICK {standalone_nick}")
-            elif cmd in ("464", "465"):
+            elif cmd in {"464", "465"}:
                 return {"error": f"IRC standalone send: server rejected client ({cmd})"}
 
         if nickserv_password:
@@ -860,9 +860,9 @@ async def _standalone_send(
                 if jcmd == "PING":
                     payload = jmsg["params"][0] if jmsg["params"] else ""
                     await _raw(f"PONG :{payload}")
-                elif jcmd in ("366", "JOIN"):
+                elif jcmd in {"366", "JOIN"}:
                     joined = True
-                elif jcmd in ("403", "405", "471", "473", "474", "475"):
+                elif jcmd in {"403", "405", "471", "473", "474", "475"}:
                     return {"error": f"IRC standalone send: JOIN {target} rejected ({jcmd})"}
 
         # Bytes-aware per-line splitting so multi-line plain text never