fix: respect per-platform disabled skills in Telegram menu and gateway dispatch (#4799)

Three interconnected bugs caused `hermes skills config` per-platform
settings to be silently ignored:

1. telegram_menu_commands() never filtered disabled skills — all skills
   consumed menu slots regardless of platform config, hitting Telegram's
   100 command cap. Now loads disabled skills for 'telegram' and excludes
   them from the menu.

2. Gateway skill dispatch executed disabled skills because
   get_skill_commands() (process-global cache) only filters by the global
   disabled list at scan time. Added per-platform check before execution,
   returning an actionable 'skill is disabled' message.

3. get_disabled_skill_names() only checked HERMES_PLATFORM env var, but
   the gateway sets HERMES_SESSION_PLATFORM instead. Added
   HERMES_SESSION_PLATFORM as fallback, plus an explicit platform=
   parameter for callers that know their platform (menu builder, gateway
   dispatch). Also added platform to prompt_builder's skills cache key
   so multi-platform gateways get correct per-platform skill prompts.

Reported by SteveSkedasticity (CLAW community).

tests/hermes_cli/test_skills_config.py

@@ -141,6 +141,109 @@ class TestIsSkillDisabled:
         assert _is_skill_disabled("discord-skill") is True
 
 
+# ---------------------------------------------------------------------------
+# get_disabled_skill_names — explicit platform param & env var fallback
+# ---------------------------------------------------------------------------
+
+class TestGetDisabledSkillNames:
+    """Tests for agent.skill_utils.get_disabled_skill_names."""
+
+    def test_explicit_platform_param(self, tmp_path, monkeypatch):
+        """Explicit platform= parameter should resolve per-platform list."""
+        config = tmp_path / "config.yaml"
+        config.write_text(
+            "skills:\n"
+            "  disabled:\n"
+            "    - global-skill\n"
+            "  platform_disabled:\n"
+            "    telegram:\n"
+            "      - tg-only-skill\n"
+        )
+        monkeypatch.setenv("HERMES_HOME", str(tmp_path))
+        monkeypatch.delenv("HERMES_PLATFORM", raising=False)
+        monkeypatch.delenv("HERMES_SESSION_PLATFORM", raising=False)
+
+        from agent.skill_utils import get_disabled_skill_names
+        result = get_disabled_skill_names(platform="telegram")
+        assert result == {"tg-only-skill"}
+
+    def test_session_platform_env_var(self, tmp_path, monkeypatch):
+        """HERMES_SESSION_PLATFORM should be used when HERMES_PLATFORM is unset."""
+        config = tmp_path / "config.yaml"
+        config.write_text(
+            "skills:\n"
+            "  disabled:\n"
+            "    - global-skill\n"
+            "  platform_disabled:\n"
+            "    discord:\n"
+            "      - discord-skill\n"
+        )
+        monkeypatch.setenv("HERMES_HOME", str(tmp_path))
+        monkeypatch.delenv("HERMES_PLATFORM", raising=False)
+        monkeypatch.setenv("HERMES_SESSION_PLATFORM", "discord")
+
+        from agent.skill_utils import get_disabled_skill_names
+        result = get_disabled_skill_names()
+        assert result == {"discord-skill"}
+
+    def test_hermes_platform_takes_precedence(self, tmp_path, monkeypatch):
+        """HERMES_PLATFORM should win over HERMES_SESSION_PLATFORM."""
+        config = tmp_path / "config.yaml"
+        config.write_text(
+            "skills:\n"
+            "  platform_disabled:\n"
+            "    telegram:\n"
+            "      - tg-skill\n"
+            "    discord:\n"
+            "      - discord-skill\n"
+        )
+        monkeypatch.setenv("HERMES_HOME", str(tmp_path))
+        monkeypatch.setenv("HERMES_PLATFORM", "telegram")
+        monkeypatch.setenv("HERMES_SESSION_PLATFORM", "discord")
+
+        from agent.skill_utils import get_disabled_skill_names
+        result = get_disabled_skill_names()
+        assert result == {"tg-skill"}
+
+    def test_explicit_param_overrides_env_vars(self, tmp_path, monkeypatch):
+        """Explicit platform= param should override all env vars."""
+        config = tmp_path / "config.yaml"
+        config.write_text(
+            "skills:\n"
+            "  platform_disabled:\n"
+            "    telegram:\n"
+            "      - tg-skill\n"
+            "    slack:\n"
+            "      - slack-skill\n"
+        )
+        monkeypatch.setenv("HERMES_HOME", str(tmp_path))
+        monkeypatch.setenv("HERMES_PLATFORM", "telegram")
+        monkeypatch.setenv("HERMES_SESSION_PLATFORM", "telegram")
+
+        from agent.skill_utils import get_disabled_skill_names
+        result = get_disabled_skill_names(platform="slack")
+        assert result == {"slack-skill"}
+
+    def test_no_platform_returns_global(self, tmp_path, monkeypatch):
+        """No platform env vars or param should return global list."""
+        config = tmp_path / "config.yaml"
+        config.write_text(
+            "skills:\n"
+            "  disabled:\n"
+            "    - global-skill\n"
+            "  platform_disabled:\n"
+            "    telegram:\n"
+            "      - tg-skill\n"
+        )
+        monkeypatch.setenv("HERMES_HOME", str(tmp_path))
+        monkeypatch.delenv("HERMES_PLATFORM", raising=False)
+        monkeypatch.delenv("HERMES_SESSION_PLATFORM", raising=False)
+
+        from agent.skill_utils import get_disabled_skill_names
+        result = get_disabled_skill_names()
+        assert result == {"global-skill"}
+
+
 # ---------------------------------------------------------------------------
 # _find_all_skills — disabled filtering
 # ---------------------------------------------------------------------------