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/focus/command.toml

@@ -0,0 +1,52 @@
+# Focus mode — combines three things real Jarvis would do for a deep-work session:
+#   1. switch active profile to "work" (mutes the noise commands)
+#   2. enable Windows Focus Assist via PowerShell
+#   3. schedule a break reminder for 50 minutes (with 10-min stretch reminder)
+# All in one voice trigger.
+
+[[commands]]
+id = "focus.start"
+type = "lua"
+script = "start.lua"
+sandbox = "full"
+timeout = 5000
+
+[commands.phrases]
+ru = [
+    "режим фокуса",
+    "включи фокус",
+    "сосредоточиться",
+    "не отвлекай",
+    "режим работы",
+    "хочу поработать",
+]
+en = [
+    "focus mode",
+    "enable focus",
+    "do not disturb",
+    "deep work",
+    "let me focus",
+]
+
+
+[[commands]]
+id = "focus.stop"
+type = "lua"
+script = "stop.lua"
+sandbox = "full"
+timeout = 5000
+
+[commands.phrases]
+ru = [
+    "выключи фокус",
+    "выключи режим фокуса",
+    "закончил работать",
+    "отключи не отвлекай",
+    "верни обычный режим",
+]
+en = [
+    "exit focus",
+    "stop focus",
+    "disable focus",
+    "i'm done working",
+]