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)).

skills/creative/comfyui/scripts/run_workflow.py

@@ -204,7 +204,7 @@ class ComfyRunner:
                     s = data.get("status")
                     if s == "completed":
                         return {"status": "success", "data": data}
-                    if s in ("failed",):
+                    if s in {"failed",}:
                         return {"status": "error", "data": data}
                     if s == "cancelled":
                         return {"status": "cancelled", "data": data}
@@ -386,7 +386,7 @@ class ComfyRunner:
         # local path; otherwise put the file in output_dir flat.
         target_parts: list[str] = []
         if preserve_subfolder and subfolder:
-            target_parts.extend(p for p in subfolder.split("/") if p and p not in (".", ".."))
+            target_parts.extend(p for p in subfolder.split("/") if p and p not in {".", ".."})
         target_parts.append(filename)
         out_path = safe_path_join(output_dir, *target_parts)
 
@@ -467,7 +467,7 @@ def inject_params(
     # Auto-randomize seed when it's -1 in args, or when randomize_seed_if_unset
     # and user didn't pass a seed.
     if "seed" in params:
-        if "seed" in args and args["seed"] in (None, -1, "-1"):
+        if "seed" in args and args["seed"] in {None, -1, "-1"}:
             args = dict(args)
             args["seed"] = coerce_seed(args["seed"])
             warnings.append(f"seed=-1 expanded to {args['seed']}")