feat(scheduler): IMBA-5 proactive scheduler — reminders, daily briefings, intervals

Background thread that wakes J.A.R.V.I.S. on a schedule to speak reminders.
Nothing else competes here on desktop — Алиса/Сири are reactive-only.

Core (crates/jarvis-core/src/scheduler.rs)
  - Schedule::{Daily{h,m}, Interval{secs}, Once{at}} with Schedule::parse for
    "daily HH:MM" / "at HH:MM" / "every N minutes|hours" / "in N minutes|hours".
    Russian units (час/часа/часов/минут/секунд) also accepted.
  - ScheduledTask {id, name, schedule, action, last_fired, enabled, created_at}.
    Action::Speak{text} | Action::Lua{script_path}.
  - JSON persistence at <APP_CONFIG_DIR>/schedule.json, atomic write-through.
  - add/remove/clear/list/find; mark_fired auto-deletes Once tasks.
  - start_background() spawns a 30-second tick thread (idempotent). Each tick
    calls due_tasks(), fires Action via tts::speak_default (after voices::play_reply
    "ahem" cue) or Lua engine.
  - 7 unit tests (all passing).

Lua API (crates/jarvis-core/src/lua/api/scheduler.rs)
  - jarvis.scheduler.add({name, schedule, action={type, text|script_path}})
  - jarvis.scheduler.{list, count, remove(id), clear}.
  - Tasks come back as {id, name, schedule_human, action, enabled, last_fired}.

Wire-up (crates/jarvis-app/src/main.rs)
  - scheduler::init() + scheduler::start_background() after profiles::init.
  - Tasks survive restarts via schedule.json.

Voice commands (resources/commands/scheduler/, 6 ids)
  - scheduler.add_reminder    "напомни через 5 минут выключить кофеварку"
  - scheduler.add_at          "напомни в 18:00 забрать ребёнка"
  - scheduler.add_recurring   "каждые 2 часа напоминай попить воды"
  - scheduler.add_daily       "каждый день в 9:00 делай briefing"
  - scheduler.list            "что у меня запланировано"
  - scheduler.clear           "очисти расписание"

Russian-aware parsers (час/часа/часов, минут/минуту/минуты) live inside the Lua
packs — easy to extend without touching Rust.

Tests: 31/31 jarvis-core unit tests pass (24 prior + 7 scheduler).
Build: cargo build --release -p jarvis-app and -p jarvis-gui both green.

resources/commands/scheduler/command.toml

@@ -0,0 +1,109 @@
+# IMBA-5: Proactive scheduler — recurring reminders, daily briefings, intervals.
+
+[[commands]]
+id = "scheduler.add_reminder"
+type = "lua"
+script = "add_reminder.lua"
+sandbox = "standard"
+timeout = 5000
+
+[commands.phrases]
+ru = [
+    "напомни мне через", "напомни через",
+    "поставь напоминалку через", "поставь напоминание через",
+    "разбуди через",
+]
+en = ["remind me in", "set a reminder in"]
+ua = ["нагадай через", "постав нагадування через"]
+
+
+[[commands]]
+id = "scheduler.add_at"
+type = "lua"
+script = "add_at.lua"
+sandbox = "standard"
+timeout = 5000
+
+[commands.phrases]
+ru = [
+    "напомни в",
+    "напомни сегодня в",
+    "разбуди в",
+    "поставь напоминалку на",
+]
+en = ["remind me at", "wake me at"]
+ua = ["нагадай о", "розбуди о"]
+
+
+[[commands]]
+id = "scheduler.add_recurring"
+type = "lua"
+script = "add_recurring.lua"
+sandbox = "standard"
+timeout = 5000
+
+[commands.phrases]
+ru = [
+    "каждые",
+    "каждый час",
+    "каждые два часа",
+    "напоминай каждые",
+    "напоминай каждый",
+]
+en = ["every", "remind me every"]
+ua = ["кожні", "нагадуй кожні"]
+
+
+[[commands]]
+id = "scheduler.add_daily"
+type = "lua"
+script = "add_daily.lua"
+sandbox = "standard"
+timeout = 5000
+
+[commands.phrases]
+ru = [
+    "каждый день в",
+    "каждое утро в",
+    "ежедневно в",
+    "по утрам в",
+]
+en = ["every day at", "daily at"]
+ua = ["щодня о", "кожен день о"]
+
+
+[[commands]]
+id = "scheduler.list"
+type = "lua"
+script = "list.lua"
+sandbox = "minimal"
+timeout = 3000
+
+[commands.phrases]
+ru = [
+    "что у меня запланировано",
+    "какие напоминания",
+    "покажи расписание",
+    "какие задачи у меня",
+    "что в расписании",
+]
+en = ["what's on my schedule", "show schedule", "list reminders"]
+ua = ["що в розкладі", "покажи розклад"]
+
+
+[[commands]]
+id = "scheduler.clear"
+type = "lua"
+script = "clear.lua"
+sandbox = "minimal"
+timeout = 3000
+
+[commands.phrases]
+ru = [
+    "очисти расписание",
+    "удали все напоминания",
+    "отмени все напоминания",
+    "сбрось расписание",
+]
+en = ["clear schedule", "cancel all reminders"]
+ua = ["очисти розклад", "скасуй всі нагадування"]