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).
5db630aae4