fix: add missing mattermost/matrix/dingtalk toolsets + platform consistency tests (salvage #3512) (#3583)

* Fixing mattermost configuration parsing bugs

* fix: add homeassistant to skills_config + platform consistency tests

Follow-up for cherry-picked #3512:
- Add homeassistant to skills_config.py PLATFORMS (was in tools_config
  but missing from skills_config)
- Add 3 consistency tests that verify all platforms in tools_config have
  matching toolset definitions, gateway includes, and skills_config entries
  — prevents this class of bug from recurring

---------

Co-authored-by: DaneelV3 <dannel@v3rtical.tech>

tests/hermes_cli/test_tools_config.py

@@ -237,3 +237,53 @@ def test_save_platform_tools_still_preserves_mcp_with_platform_default_present()
 
     # Deselected configurable toolset removed
     assert "terminal" not in saved
+
+
+# ── Platform / toolset consistency ────────────────────────────────────────────
+
+
+class TestPlatformToolsetConsistency:
+    """Every platform in tools_config.PLATFORMS must have a matching toolset."""
+
+    def test_all_platforms_have_toolset_definitions(self):
+        """Each platform's default_toolset must exist in TOOLSETS."""
+        from hermes_cli.tools_config import PLATFORMS
+        from toolsets import TOOLSETS
+
+        for platform, meta in PLATFORMS.items():
+            ts_name = meta["default_toolset"]
+            assert ts_name in TOOLSETS, (
+                f"Platform {platform!r} references toolset {ts_name!r} "
+                f"which is not defined in toolsets.py"
+            )
+
+    def test_gateway_toolset_includes_all_messaging_platforms(self):
+        """hermes-gateway includes list should cover all messaging platforms."""
+        from hermes_cli.tools_config import PLATFORMS
+        from toolsets import TOOLSETS
+
+        gateway_includes = set(TOOLSETS["hermes-gateway"]["includes"])
+        # Exclude non-messaging platforms from the check
+        non_messaging = {"cli", "api_server"}
+        for platform, meta in PLATFORMS.items():
+            if platform in non_messaging:
+                continue
+            ts_name = meta["default_toolset"]
+            assert ts_name in gateway_includes, (
+                f"Platform {platform!r} toolset {ts_name!r} missing from "
+                f"hermes-gateway includes"
+            )
+
+    def test_skills_config_covers_tools_config_platforms(self):
+        """skills_config.PLATFORMS should have entries for all gateway platforms."""
+        from hermes_cli.tools_config import PLATFORMS as TOOLS_PLATFORMS
+        from hermes_cli.skills_config import PLATFORMS as SKILLS_PLATFORMS
+
+        non_messaging = {"api_server"}
+        for platform in TOOLS_PLATFORMS:
+            if platform in non_messaging:
+                continue
+            assert platform in SKILLS_PLATFORMS, (
+                f"Platform {platform!r} in tools_config but missing from "
+                f"skills_config PLATFORMS"
+            )