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)).

tests/agent/lsp/_mock_lsp_server.py

@@ -91,7 +91,7 @@ def main():
         if msg.get("method") == "workspace/didChangeWatchedFiles":
             continue
 
-        if msg.get("method") in ("textDocument/didOpen", "textDocument/didChange"):
+        if msg.get("method") in {"textDocument/didOpen", "textDocument/didChange"}:
             params = msg.get("params") or {}
             td = params.get("textDocument") or {}
             uri = td.get("uri", "")

tests/agent/lsp/test_install_and_lint_fixes.py

@@ -87,10 +87,10 @@ def test_install_npm_works_without_extras(tmp_path, monkeypatch):
     cmd = captured["cmd"]
     assert "pyright" in cmd
     # Should not blow up when extra_pkgs is omitted/None
-    install_targets = [c for c in cmd if not c.startswith("-") and c not in (
+    install_targets = [c for c in cmd if not c.startswith("-") and c not in {
         "install", "--prefix", str(install_mod.hermes_lsp_bin_dir().parent),
         "/usr/bin/npm",
-    )]
+    }]
     assert install_targets == ["pyright"]
 
 

tests/agent/test_anthropic_adapter.py

@@ -1658,7 +1658,7 @@ class TestThinkingBlockSignatureManagement:
         _, result = convert_messages_to_anthropic(messages)
         assistant = next(m for m in result if m["role"] == "assistant")
         for block in assistant["content"]:
-            if block.get("type") in ("thinking", "redacted_thinking"):
+            if block.get("type") in {"thinking", "redacted_thinking"}:
                 assert "cache_control" not in block
 
     def test_thinking_stripped_from_merged_consecutive_assistants(self):
@@ -1748,7 +1748,7 @@ class TestThinkingBlockSignatureManagement:
         # First two: no thinking blocks
         for a in assistants[:2]:
             assert not any(
-                b.get("type") in ("thinking", "redacted_thinking")
+                b.get("type") in {"thinking", "redacted_thinking"}
                 for b in a["content"]
                 if isinstance(b, dict)
             )

tests/agent/test_auxiliary_main_first.py

@@ -371,7 +371,7 @@ class TestResolveVisionMainFirst:
             provider, client, model = resolve_vision_provider_client()
 
         assert client is fallback_client
-        assert provider in ("openrouter", "nous")
+        assert provider in {"openrouter", "nous"}
 
     def test_explicit_provider_override_still_wins(self):
         """Explicit config override bypasses main-first policy."""

tests/agent/test_context_compressor.py

@@ -1046,7 +1046,7 @@ class TestCompressWithClient:
         for i in range(1, len(result)):
             r1 = result[i - 1].get("role")
             r2 = result[i].get("role")
-            if r1 in ("user", "assistant") and r2 in ("user", "assistant"):
+            if r1 in {"user", "assistant"} and r2 in {"user", "assistant"}:
                 assert r1 != r2, f"consecutive {r1} at indices {i-1},{i}"
 
     def test_double_collision_merges_summary_into_tail(self):
@@ -1087,7 +1087,7 @@ class TestCompressWithClient:
         for i in range(1, len(result)):
             r1 = result[i - 1].get("role")
             r2 = result[i].get("role")
-            if r1 in ("user", "assistant") and r2 in ("user", "assistant"):
+            if r1 in {"user", "assistant"} and r2 in {"user", "assistant"}:
                 assert r1 != r2, f"consecutive {r1} at indices {i-1},{i}"
 
         # The summary text should be merged into the first tail message
@@ -1164,7 +1164,7 @@ class TestCompressWithClient:
         for i in range(1, len(result)):
             r1 = result[i - 1].get("role")
             r2 = result[i].get("role")
-            if r1 in ("user", "assistant") and r2 in ("user", "assistant"):
+            if r1 in {"user", "assistant"} and r2 in {"user", "assistant"}:
                 assert r1 != r2, f"consecutive {r1} at indices {i-1},{i}"
 
         # The summary should be merged into the first tail message (assistant at index 5)

tests/agent/test_deepseek_anthropic_thinking.py

@@ -191,7 +191,7 @@ class TestDeepSeekAnthropicPreservesThinking:
             if not isinstance(m.get("content"), list):
                 continue
             for b in m["content"]:
-                if isinstance(b, dict) and b.get("type") in ("thinking", "redacted_thinking"):
+                if isinstance(b, dict) and b.get("type") in {"thinking", "redacted_thinking"}:
                     assert "cache_control" not in b
 
     def test_openai_compat_deepseek_base_is_not_matched(self) -> None: