chore: remove unused imports and dead locals (ruff F401, F841) (#17010)

Mechanical cleanup across 43 files — removes 46 unused imports
(F401) and 14 unused local variables (F841) detected by
`ruff check --select F401,F841`. Net: -49 lines.

Also fixes a latent NameError in rl_cli.py where `get_hermes_home()`
was called at module line 32 before its import at line 65 — the
module never imported successfully on main. The ruff audit surfaced
this because it correctly saw the symbol as imported-but-unused
(the call happened before the import ran); the fix moves the import
to the top of the file alongside other stdlib imports.

One `# noqa: F401` kept in hermes_cli/status.py for `subprocess`:
tests monkeypatch `hermes_cli.status.subprocess` as a regression
guard that systemctl isn't called on Termux, so the name must
exist at module scope even though the module body doesn't reference
it. Docstring explains the reason.

Also fixes an invalid `# noqa:` directive in
gateway/platforms/discord.py:308 that lacked a rule code.

Co-authored-by: teknium1 <teknium@users.noreply.github.com>

rl_cli.py

@@ -27,6 +27,8 @@ from pathlib import Path
 import fire
 import yaml
 
+from hermes_constants import OPENROUTER_BASE_URL, get_hermes_home
+
 # Load .env from ~/.hermes/.env first, then project root as dev fallback.
 # User-managed env files should override stale shell exports on restart.
 _hermes_home = get_hermes_home()
@@ -60,8 +62,6 @@ from tools.rl_training_tool import get_missing_keys
 # Config Loading
 # ============================================================================
 
-from hermes_constants import get_hermes_home, OPENROUTER_BASE_URL
-
 DEFAULT_MODEL = "anthropic/claude-opus-4.5"
 DEFAULT_BASE_URL = OPENROUTER_BASE_URL
 
@@ -412,7 +412,7 @@ def main(
                 
                 # Run the agent
                 print("\n" + "=" * 60)
-                response = agent.run_conversation(user_input)
+                agent.run_conversation(user_input)
                 print("\n" + "=" * 60)
                 
             except KeyboardInterrupt:
@@ -429,7 +429,7 @@ def main(
         print("-" * 40)
         
         try:
-            response = agent.run_conversation(task)
+            agent.run_conversation(task)
             print("\n" + "=" * 60)
             print("✅ Task completed")
         except KeyboardInterrupt: