P1.1: Report each account's status to the master's ledger

Every FirmStats now carries statusVersion 1, the catalog firmId and, once
synced, syncedAt (from lastSyncAt), including the no-accounts branch, which
is now built by emptyFirmStats(). Each accounts[] entry adds status, reason,
balance, floor, accountTypeId, firstFundDate, positiveFunds and brokerStatus,
each left out when null or at its default.

accountStatus() in platform-client.ts is pure: a missing balance is unknown
(cash_missing), never dead; with a balance, dead is exactly the old floor
test (legacyDead); then history_pending, locked, live. Only the reporter
uses it. The aggregates, totals and every trading decision keep their own
dead test, unchanged.

The reporter reads history readiness through a new Tradovate
peekHistoryReady(), because historyReady() there can start a hold and move
the balance baseline. DXTrade exposes accountStatus and registrationTime via
brokerAccountMeta(). A throw in the new fields reports the account as
unknown instead of losing the report.

sendReport skips the socket for a firms payload over 900,000 chars (the
master's frame cap is 1,000,000 bytes) and POSTs it, logging once per switch.

scripts/check-account-status.mjs proves the legacy invariant over the full
matrix and the size budget (worst 228 B added per account, 154 B typical
live; 2000 accounts 592,501 B).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

package.json

@@ -7,7 +7,7 @@
     "build": "next build",
     "start": "next start",
     "lint": "eslint",
-    "check": "node --experimental-strip-types --disable-warning=MODULE_TYPELESS_PACKAGE_JSON --test scripts/check-trading-logic.mjs scripts/check-instruments.mjs"
+    "check": "node --experimental-strip-types --disable-warning=MODULE_TYPELESS_PACKAGE_JSON --test scripts/check-trading-logic.mjs scripts/check-instruments.mjs scripts/check-account-status.mjs"
   },
   "dependencies": {
     "@microsoft/signalr": "^10.0.11",