feat: Wave 6 — focus mode, cooking timer, memory admin

Focus mode (`focus/`):
- focus.start ("режим фокуса" / "focus mode"): three side-effects in one
  voice trigger:
    1. switch profile to "work" (silences fun/banter)
    2. enable Windows Focus Assist via registry tweak (QuietHours key)
    3. schedule a stretch reminder in 50 minutes through the persistent
       scheduler — so it survives daemon restart
- focus.stop: undoes all three, including cancelling pending stretch
  reminders by matching their scheduler name. Best-effort: any one
  failing doesn't block the others.

Cooking timer (`cooking/`):
- Recognises 16+ dish names (чай, кофе, омлет, яйца, макароны, паста,
  рис, гречка, картошка, курица, пицца, etc.) and starts a preset-
  duration scheduler reminder ("Сэр, чай готов.").
- Single Lua script, table-driven — adding a recipe is one line.
- EN phrases for the same dishes ("boiling pasta", "frying eggs", ...).

Memory admin (`memory_admin/`):
- memory_admin.count → speak fact count with full RU pluralisation.
- memory_admin.list → speak 5 most-recent + toast the rest.
- memory_admin.wipe → ONLY fires on "точно забудь все" prefix (not bare
  "забудь все") so we can't disaster-wipe by accident.
- Adds `long_term_memory::clear_all() -> usize` returning removed count
  + Lua binding `jarvis.memory.clear_all()`.
- One extra unit test for `clear_all`.

Tests: 139 → 140 (+1). Pack count: 92 → 95.

resources/commands/memory_admin/command.toml

@@ -0,0 +1,66 @@
+# Memory admin — voice-driven housekeeping for the long-term memory.
+# - "сколько фактов помнишь" → speak count
+# - "выгрузи список фактов" → notify with first ~10 keys
+# - "забудь все" → wipe everything (with safety prefix "точно забудь все")
+
+[[commands]]
+id = "memory_admin.count"
+type = "lua"
+script = "count.lua"
+sandbox = "minimal"
+timeout = 2000
+
+[commands.phrases]
+ru = [
+    "сколько фактов помнишь",
+    "сколько ты помнишь",
+    "сколько у тебя в памяти",
+    "размер памяти",
+]
+en = [
+    "how many facts do you remember",
+    "how big is your memory",
+    "memory size",
+]
+
+
+[[commands]]
+id = "memory_admin.list"
+type = "lua"
+script = "list.lua"
+sandbox = "minimal"
+timeout = 2000
+
+[commands.phrases]
+ru = [
+    "выгрузи список фактов",
+    "покажи что помнишь",
+    "перечисли что помнишь",
+    "что у тебя в памяти",
+]
+en = [
+    "list what you remember",
+    "show me your memory",
+    "what's in memory",
+]
+
+
+[[commands]]
+id = "memory_admin.wipe"
+type = "lua"
+script = "wipe.lua"
+sandbox = "minimal"
+timeout = 2000
+
+[commands.phrases]
+ru = [
+    "точно забудь все",
+    "точно забудь всё",
+    "сотри всю память",
+    "wipe memory",
+]
+en = [
+    "wipe all memory",
+    "really forget everything",
+    "clear all memory",
+]