fix(cli): respect HERMES_HOME in all remaining hardcoded ~/.hermes paths

Several files resolved paths via Path.home() / ".hermes" or
os.path.expanduser("~/.hermes/..."), bypassing the HERMES_HOME
environment variable. This broke isolation when running multiple
Hermes instances with distinct HERMES_HOME directories.

Replace all hardcoded paths with calls to get_hermes_home() from
hermes_cli.config, consistent with the rest of the codebase.

Files fixed:
- tools/process_registry.py (processes.json)
- gateway/pairing.py (pairing/)
- gateway/sticker_cache.py (sticker_cache.json)
- gateway/channel_directory.py (channel_directory.json, sessions.json)
- gateway/config.py (gateway.json, config.yaml, sessions_dir)
- gateway/mirror.py (sessions/)
- gateway/hooks.py (hooks/)
- gateway/platforms/base.py (image_cache/, audio_cache/, document_cache/)
- gateway/platforms/whatsapp.py (whatsapp/session)
- gateway/delivery.py (cron/output)
- agent/auxiliary_client.py (auth.json)
- agent/prompt_builder.py (SOUL.md)
- cli.py (config.yaml, images/, pastes/, history)
- run_agent.py (logs/)
- tools/environments/base.py (sandboxes/)
- tools/environments/modal.py (modal_snapshots.json)
- tools/environments/singularity.py (singularity_snapshots.json)
- tools/tts_tool.py (audio_cache)
- hermes_cli/status.py (cron/jobs.json, sessions.json)
- hermes_cli/gateway.py (logs/, whatsapp session)
- hermes_cli/main.py (whatsapp/session)

Tests updated to use HERMES_HOME env var instead of patching Path.home().

Closes #892

(cherry picked from commit 78ac1bba43b8b74a934c6172f2c29bb4d03164b9)

gateway/config.py

@@ -16,6 +16,8 @@ from dataclasses import dataclass, field
 from typing import Dict, List, Optional, Any
 from enum import Enum
 
+from hermes_cli.config import get_hermes_home
+
 logger = logging.getLogger(__name__)
 
 
@@ -151,7 +153,7 @@ class GatewayConfig:
     reset_triggers: List[str] = field(default_factory=lambda: ["/new", "/reset"])
     
     # Storage paths
-    sessions_dir: Path = field(default_factory=lambda: Path.home() / ".hermes" / "sessions")
+    sessions_dir: Path = field(default_factory=lambda: get_hermes_home() / "sessions")
     
     # Delivery settings
     always_log_local: bool = True  # Always save cron outputs to local files
@@ -246,7 +248,7 @@ class GatewayConfig:
         if "default_reset_policy" in data:
             default_policy = SessionResetPolicy.from_dict(data["default_reset_policy"])
         
-        sessions_dir = Path.home() / ".hermes" / "sessions"
+        sessions_dir = get_hermes_home() / "sessions"
         if "sessions_dir" in data:
             sessions_dir = Path(data["sessions_dir"])
         
@@ -274,7 +276,8 @@ def load_gateway_config() -> GatewayConfig:
     config = GatewayConfig()
     
     # Try loading from ~/.hermes/gateway.json
-    gateway_config_path = Path.home() / ".hermes" / "gateway.json"
+    _home = get_hermes_home()
+    gateway_config_path = _home / "gateway.json"
     if gateway_config_path.exists():
         try:
             with open(gateway_config_path, "r", encoding="utf-8") as f:
@@ -282,13 +285,13 @@ def load_gateway_config() -> GatewayConfig:
                 config = GatewayConfig.from_dict(data)
         except Exception as e:
             print(f"[gateway] Warning: Failed to load {gateway_config_path}: {e}")
-    
+
     # Bridge session_reset from config.yaml (the user-facing config file)
     # into the gateway config. config.yaml takes precedence over gateway.json
     # for session reset policy since that's where hermes setup writes it.
     try:
         import yaml
-        config_yaml_path = Path.home() / ".hermes" / "config.yaml"
+        config_yaml_path = _home / "config.yaml"
         if config_yaml_path.exists():
             with open(config_yaml_path, encoding="utf-8") as f:
                 yaml_cfg = yaml.safe_load(f) or {}
@@ -481,7 +484,7 @@ def _apply_env_overrides(config: GatewayConfig) -> None:
 
 def save_gateway_config(config: GatewayConfig) -> None:
     """Save gateway configuration to ~/.hermes/gateway.json."""
-    gateway_config_path = Path.home() / ".hermes" / "gateway.json"
+    gateway_config_path = get_hermes_home() / "gateway.json"
     gateway_config_path.parent.mkdir(parents=True, exist_ok=True)
     
     with open(gateway_config_path, "w", encoding="utf-8") as f: