docs: comprehensive AGENTS.md audit and corrections

Major fixes:
- Default model: claude-sonnet-4.6 → claude-opus-4.6
- max_iterations default: 60 → 90 (also fixed in config.py OPTIONAL_ENV_VARS description)
- chat() signature: chat(user_message, task_id) → chat(message)
- Agent loop: _run_agent_loop() doesn't exist, loop is in run_conversation()
- Removed async/await references (agent is entirely synchronous)
- KawaiiSpinner location: run_agent.py → agent/display.py
- NOUS_API_KEY removed (not used by any tool), replaced with VOICE_TOOLS_OPENAI_KEY
- OPENAI_API_KEY for Whisper → VOICE_TOOLS_OPENAI_KEY
- check_for_missing_config() → check_config_version() + get_missing_env_vars()
- Adding tools: '2 files' → '3 files' (tool + model_tools.py + toolsets.py)
- Venv path: venv/ → .venv/
- Trajectory output path: trajectories/*.jsonl → trajectory_samples.jsonl
- process_command() location clarified (HermesCLI in cli.py, not commands.py)
- REQUIRED_ENV_VARS noted as intentionally empty
- _config_version noted as currently at version 5

New content:
- Project structure: added 40+ missing files across agent/, hermes_cli/, tools/, gateway/
- Full gateway/ directory listing with all modules and platforms/
- Added honcho_integration/, scripts/, tests/ directories
- Added hermes_constants.py, hermes_time.py, trajectory_compressor.py, utils.py
- CLI commands table: added 25+ missing commands (model, login, logout, whatsapp,
  skills subsystem, tools, insights, gateway start/stop/restart/status/uninstall,
  sessions export/delete/prune/stats, config path/env-path/show)
- Gateway slash commands section with all 20+ commands
- Platform toolsets: added hermes-cli, hermes-slack, hermes-homeassistant, hermes-gateway
- Gateway: added Home Assistant as supported platform

hermes_cli/config.py

@@ -422,7 +422,7 @@ OPTIONAL_ENV_VARS = {
         "category": "setting",
     },
     "HERMES_MAX_ITERATIONS": {
-        "description": "Maximum tool-calling iterations per conversation (default: 60)",
+        "description": "Maximum tool-calling iterations per conversation (default: 90)",
         "prompt": "Max iterations",
         "url": None,
         "password": False,