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)).

optional-skills/research/darwinian-evolver/scripts/show_snapshot.py

@@ -51,7 +51,7 @@ def main() -> int:
         field = args.field
         if field is None:
             for k, v in vars(org).items():
-                if isinstance(v, str) and not k.startswith("_") and k not in ("id",):
+                if isinstance(v, str) and not k.startswith("_") and k not in {"id",}:
                     field = k
                     break
         val = getattr(org, field, None) if field else None

optional-skills/research/domain-intel/scripts/domain_intel.py

@@ -185,7 +185,7 @@ def whois_lookup(domain):
     for key, pat in patterns.items():
         matches = re.findall(pat, raw, re.IGNORECASE)
         if matches:
-            if key in ("name_servers", "status"):
+            if key in {"name_servers", "status"}:
                 result[key] = list(dict.fromkeys(m.strip().lower() for m in matches))
             else:
                 result[key] = matches[0].strip()

optional-skills/research/osint-investigation/scripts/_http.py

@@ -60,7 +60,7 @@ def get(
                     f"HTTP 429 rate-limited by {urllib.parse.urlsplit(url).netloc}. "
                     f"Slow down or supply a real API key. Body: {body[:300]}"
                 ) from e
-            if e.code in (500, 502, 503, 504) and attempt < max_retries:
+            if e.code in {500, 502, 503, 504} and attempt < max_retries:
                 retry_after = e.headers.get("Retry-After") if e.headers else None
                 wait = float(retry_after) if (retry_after and retry_after.isdigit()) else backoff ** (attempt + 1)
                 time.sleep(wait)

optional-skills/research/osint-investigation/scripts/fetch_icij_offshore.py

@@ -122,7 +122,7 @@ def fetch(
 
     with zipfile.ZipFile(zip_path) as zf:
         for node_type, csv_substring in targets:
-            relevant_needles = [n for (k, n) in needles if k in (node_type, "Entity", "Officer")] or []
+            relevant_needles = [n for (k, n) in needles if k in {node_type, "Entity", "Officer"}] or []
             # Only scan a CSV if we have a needle that could plausibly match it,
             # or if we have ONLY a jurisdiction filter.
             applicable_needles = [n for (k, n) in needles if k == node_type]