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/cooking/timer.lua

@@ -0,0 +1,84 @@
+-- Cooking timer — recognise the dish in the phrase and schedule a "ready!"
+-- reminder for the right number of minutes. Falls through to a generic
+-- "couldn't recognise" reply if nothing matched.
+--
+-- The duration table is opinionated but covers the common Russian kitchen
+-- staples. Power users can override via `recipes.txt` (TODO future) — for
+-- now, edit this file or use the generic `reminders/set` pack.
+
+local lang = jarvis.context.language
+local phrase = (jarvis.context.phrase or ""):lower()
+
+-- pattern -> { minutes, ru_label, en_label }
+local recipes = {
+    { "чайник",       4,  "чайник",         "kettle" },
+    { "boiling water",4,  "вода",           "boiling water" },
+    { "французск",    4,  "френч-пресс",    "french press" },
+    { "french press", 4,  "френч-пресс",    "french press" },
+    { "чай",          5,  "чай",            "tea" },
+    { "brewing tea",  5,  "чай",            "tea" },
+    { "омлет",        5,  "омлет",          "omelette" },
+    { "омлеt",        5,  "омлет",          "omelette" }, -- mis-STT guard
+    { "яичниц",       5,  "яичница",        "fried eggs" },
+    { "frying eggs",  5,  "яичница",        "fried eggs" },
+    { "frying omelet",5,  "омлет",          "omelette" },
+    { "кофе",         5,  "кофе",           "coffee" },
+    { "brewing coff", 5,  "кофе",           "coffee" },
+    { "яйц",          8,  "яйца",           "eggs" },
+    { "boiling eggs", 8,  "яйца",           "eggs" },
+    { "макарон",      10, "макароны",       "pasta" },
+    { "паст",         10, "паста",          "pasta" },
+    { "cooking pasta",10, "паста",          "pasta" },
+    { "boiling pasta",10, "паста",          "pasta" },
+    { "рис",          18, "рис",            "rice" },
+    { "cooking rice", 18, "рис",            "rice" },
+    { "греч",         20, "гречка",         "buckwheat" },
+    { "каш",          20, "каша",           "porridge" },
+    { "porridge",     20, "каша",           "porridge" },
+    { "картош",       22, "картошка",       "potatoes" },
+    { "пицц",         15, "пицца",          "pizza" },
+    { "baking pizza", 15, "пицца",          "pizza" },
+    { "куриц",        35, "курица",         "chicken" },
+    { "chicken",      35, "курица",         "chicken" },
+}
+
+local matched_minutes, label_ru, label_en = nil, nil, nil
+for _, r in ipairs(recipes) do
+    if phrase:find(r[1], 1, true) then
+        matched_minutes, label_ru, label_en = r[2], r[3], r[4]
+        break
+    end
+end
+
+if not matched_minutes then
+    return jarvis.cmd.not_found(lang == "ru"
+        and "Не понял, что ты готовишь, сэр."
+        or  "I didn't catch what you're cooking, sir.")
+end
+
+local label = (lang == "ru") and label_ru or label_en
+local speak_text = (lang == "ru" and "Сэр, " or "Sir, ")
+    .. label .. (lang == "ru" and " готов." or " is ready.")
+
+local ok, err = pcall(function()
+    jarvis.scheduler.add({
+        name     = (lang == "ru" and "Кухня: " or "Cooking: ") .. label,
+        schedule = "in " .. tostring(matched_minutes) .. " minutes",
+        action   = { type = "speak", text = speak_text },
+    })
+end)
+if not ok then
+    jarvis.log("error", "cooking timer: scheduler.add failed: " .. tostring(err))
+    return jarvis.cmd.error(lang == "ru" and "Не получилось поставить таймер."
+                                           or "Couldn't set timer.")
+end
+
+jarvis.system.notify(
+    lang == "ru" and "Таймер" or "Timer",
+    string.format("%s — %d мин", label, matched_minutes)
+)
+
+return jarvis.cmd.ok(string.format(lang == "ru"
+    and "Хорошо, напомню через %d минут когда %s будет готов."
+    or  "Right — I'll remind you in %d minutes when %s is ready.",
+    matched_minutes, label))