feat: Wave 10 — expense tracker pack (voice-driven)

resources/commands/expenses/ (4 commands):
- expenses.log     "потратил 500 на еду"     → append entry
- expenses.today   "сколько потратил сегодня" → today's total
- expenses.week    "сколько на неделе"       → 7-day rolling total
- expenses.breakdown "куда ушли деньги"      → top-5 categories

Storage: `jarvis.state` (auto-namespaced per-pack JSON). Wire format is
compact "ts1,amount1,cat1|ts2,amount2,cat2" so we don't need a JSON parser
inside Lua.

Phrase parsing:
- Trigger stripped via jarvis.text.strip_trigger.
- First number captured; "12,50" comma decimals accepted.
- Category extracted from "на <слово>" (RU) or "for/on <word>" (EN);
  defaults to "разное" / "misc".

Time math:
- Day boundary: local-calendar midnight via os.time({year,month,day,...}).
- Week boundary: rolling 7×86400 seconds.

Pack count: 98 → 99 functional.

resources/commands/expenses/command.toml

@@ -0,0 +1,91 @@
+# Personal-finance tracker — voice-log expenses by category, get totals.
+# Storage is per-pack via `jarvis.state` (auto-namespaced JSON), so it doesn't
+# bleed into other packs' data.
+#
+# Voice flow:
+#   "потратил 500 на еду"      → log entry (amount=500, category="еда")
+#   "сколько я потратил сегодня" → speak today's total
+#   "сколько на этой неделе"    → speak 7-day total
+#   "куда ушли деньги"          → speak per-category breakdown for the week
+
+[[commands]]
+id = "expenses.log"
+type = "lua"
+script = "log.lua"
+sandbox = "standard"
+timeout = 3000
+
+[commands.phrases]
+ru = [
+    "потратил",
+    "записать трату",
+    "запиши трату",
+    "купил за",
+    "заплатил за",
+]
+en = [
+    "spent",
+    "log expense",
+    "paid for",
+    "bought",
+]
+
+
+[[commands]]
+id = "expenses.today"
+type = "lua"
+script = "today.lua"
+sandbox = "standard"
+timeout = 3000
+
+[commands.phrases]
+ru = [
+    "сколько я потратил сегодня",
+    "траты сегодня",
+    "сколько ушло сегодня",
+]
+en = [
+    "spending today",
+    "expenses today",
+    "how much spent today",
+]
+
+
+[[commands]]
+id = "expenses.week"
+type = "lua"
+script = "week.lua"
+sandbox = "standard"
+timeout = 3000
+
+[commands.phrases]
+ru = [
+    "сколько я потратил на этой неделе",
+    "траты на неделе",
+    "недельные траты",
+]
+en = [
+    "spending this week",
+    "weekly expenses",
+]
+
+
+[[commands]]
+id = "expenses.breakdown"
+type = "lua"
+script = "breakdown.lua"
+sandbox = "standard"
+timeout = 3000
+
+[commands.phrases]
+ru = [
+    "куда ушли деньги",
+    "разбивка по тратам",
+    "на что я тратил",
+    "разбивка по категориям",
+]
+en = [
+    "where did the money go",
+    "expense breakdown",
+    "spending by category",
+]