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).

agent/prompt_builder.py

@@ -488,11 +488,19 @@ def build_skills_system_prompt(
         return ""
 
     # ── Layer 1: in-process LRU cache ─────────────────────────────────
+    # Include the resolved platform so per-platform disabled-skill lists
+    # produce distinct cache entries (gateway serves multiple platforms).
+    _platform_hint = (
+        os.environ.get("HERMES_PLATFORM")
+        or os.environ.get("HERMES_SESSION_PLATFORM")
+        or ""
+    )
     cache_key = (
         str(skills_dir.resolve()),
         tuple(str(d) for d in external_dirs),
         tuple(sorted(str(t) for t in (available_tools or set()))),
         tuple(sorted(str(ts) for ts in (available_toolsets or set()))),
+        _platform_hint,
     )
     with _SKILLS_PROMPT_CACHE_LOCK:
         cached = _SKILLS_PROMPT_CACHE.get(cache_key)

agent/skill_utils.py

@@ -118,12 +118,17 @@ def skill_matches_platform(frontmatter: Dict[str, Any]) -> bool:
 # ── Disabled skills ───────────────────────────────────────────────────────
 
 
-def get_disabled_skill_names() -> Set[str]:
+def get_disabled_skill_names(platform: str | None = None) -> Set[str]:
     """Read disabled skill names from config.yaml.
 
-    Resolves platform from ``HERMES_PLATFORM`` env var, falls back to
-    the global disabled list.  Reads the config file directly (no CLI
-    config imports) to stay lightweight.
+    Args:
+        platform: Explicit platform name (e.g. ``"telegram"``).  When
+            *None*, resolves from ``HERMES_PLATFORM`` or
+            ``HERMES_SESSION_PLATFORM`` env vars.  Falls back to the
+            global disabled list when no platform is determined.
+
+    Reads the config file directly (no CLI config imports) to stay
+    lightweight.
     """
     config_path = get_hermes_home() / "config.yaml"
     if not config_path.exists():
@@ -140,7 +145,11 @@ def get_disabled_skill_names() -> Set[str]:
     if not isinstance(skills_cfg, dict):
         return set()
 
-    resolved_platform = os.getenv("HERMES_PLATFORM")
+    resolved_platform = (
+        platform
+        or os.getenv("HERMES_PLATFORM")
+        or os.getenv("HERMES_SESSION_PLATFORM")
+    )
     if resolved_platform:
         platform_disabled = (skills_cfg.get("platform_disabled") or {}).get(
             resolved_platform