Respect HERMES_IGNORE_RULES in gateway agent creation

[prantikmedhi]

What changed

This threads HERMES_IGNORE_RULES through the two gateway AIAgent(...) construction paths that were still missing it:

• the main cached/session agent path in gateway/run.py
• the /background task path in gateway/run.py

I also added regression coverage for both paths in tests/gateway/test_session_model_override_routing.py.

Why

cli.py already turns HERMES_IGNORE_RULES=1 into skip_context_files=True and skip_memory=True, but gateway sessions were still building fresh agents without those flags. That meant Telegram and other gateway-driven sessions could keep injecting memory and context files even when the env var was set.

Validation

I couldn't get a full working clone of this repo to complete cleanly in this environment, so I wasn't able to run the repo's pytest target here. I did at least verify the edited Python files compile with python3 -m py_compile.

Fixes #29911.

[prantikmedhi]

Took the smallest path I could here. The actual fix is just wiring HERMES_IGNORE_RULES into the two gateway AIAgent(...) constructors that were still bypassing it, plus a couple of regression tests so it does not drift again later. I couldn’t get a full local clone of this repo to finish cleanly in this environment, so I only verified syntax with python3 -m py_compile rather than a full pytest run.

[teknium1]

Thanks for the focused regression fix. Current main still omits both flags in the background constructor at gateway/run.py:13408 and the fresh session-agent constructor at gateway/run.py:18292; agent/agent_init.py:1363 confirms that skip_memory=True prevents persistent-memory initialization, while agent/system_prompt.py:446 gates context-file injection on skip_context_files.

The original branch predates substantial movement in gateway/run.py, so salvage should relocate the same two additions into these current constructors and retain the two constructor-capture regressions.

Automated hermes-sweeper review.