Add hledger tools to Telegram bot

- New Omni/Agent/Tools/Hledger.hs with 5 tools:
  - hledger_balance: query account balances
  - hledger_register: show transaction history
  - hledger_add: create new transactions
  - hledger_income_statement: income vs expenses
  - hledger_balance_sheet: net worth view

- All tools support currency parameter (default: USD)
- Balance, register, income_statement support period parameter
- Period uses hledger syntax (thismonth, 2024, from X to Y)
- Shell escaping fixed for multi-word period strings

- Authorization: only Ben and Kate get hledger tools
- Max iterations increased from 5 to 10
- Transactions written to ~/fund/telegram-transactions.journal

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