Tie out the migrated ledger account by account

**Objective:** Compare the Dynamics GP trial balance for fiscal year `{fiscal-year}` through period `{through-period}` (default 12) with Business Central G/L balances as of `{as-of-date}`, where the fiscal year began on `{fiscal-year-start}`.

**Step 1: Build the GP trial balance**

Call `dynamics-gp-get-gl-account-summary` with `year` set to `{fiscal-year}`, with a `max-records` large enough for every account and period. For each account-number:

* Balance Sheet accounts (posting-type): add up period-balance for period-id 0 (the beginning balance) through `{through-period}`.
* Profit and Loss accounts: add up period-balance for period-id 1 through `{through-period}`.

Then roll the GP accounts up by main-account-segment. The GP migration maps the main segment to the BC G/L account number and moves the other segments to dimensions, so several GP accounts land on one BC account.

**Step 2: Read the BC chart of accounts**

Call `business-central-get-account` with `account-type` set to Posting. Match GP main-account-segment to BC account-number, trimmed. Use income-balance to tell Balance Sheet accounts from Income Statement accounts.

**Step 3: Build the BC balances**

For each matched account, call `business-central-get-general-ledger-entry` with `gl-account-number`, `posting-date.to` set to `{as-of-date}`, and for Income Statement accounts `posting-date.from` set to `{fiscal-year-start}`. Add up amount. If a call returns exactly `max-records` rows, say that account's total may be incomplete.

**Step 4: Report**

A table per account: account number, name, GP balance, BC balance, difference, sorted by the absolute difference, largest first. Then: GP accounts with no BC account, BC accounts with a balance and no GP account, total debits and credits on each side, and whether each side nets to zero.

**Rules & Guidelines:**

* `dynamics-gp-get-gl-account-summary` is on the dynamics-gp server. `business-central-get-account` and `business-central-get-general-ledger-entry` are on the business-central server.
* This prompt is read-only. Do NOT call `business-central-create-journal`, `business-central-create-journal-line`, `business-central-update-journal-line`, `dynamics-gp-gl-account-transaction-add` or `dynamics-gp-gl-account-add`.
* If either system has more than one company, ask the user which GP company and which BC company to use before the first call, and pass them as `company`.

**Validation:**

* If `{as-of-date}` is not the last day of GP period `{through-period}`, say that the two sides cover different dates and the comparison is approximate.
* If most BC accounts have no entries at all, report that the opening balances have not been posted in BC yet and stop after the account mapping.
* If the GP main segment and BC account numbers do not line up for most accounts, the customer used a custom account mapping. Stop, show a sample of both, and ask the user for the mapping instead of guessing.