refactor!: simplify runtime coordination #7

Keep financial ownership, atomic publication and refresh CAS.
Failed refresh leaves cookies untouched; logout still clears them.

Remove full-history candle prefetch and special metadata retries.
Use native Pino request context instead of parallel middleware.

BREAKING CHANGE: remove investment stateVersion, queued sync state,
and tbank-sync status progress/resources. Consumers must observe
resources through sync=observe with the updated frontend contract.

src/integrations/tbank/tbank.client.ts

@@ -46,10 +46,8 @@ const NO_RPC_ATTEMPTS = 0;
 const NEXT_DAY_OFFSET = 1;
 
 const RATE_WINDOW_MS = 1_000;
-const METADATA_MAX_ATTEMPTS = 3;
 const RPC_MAX_ATTEMPTS = 2;
 const MAX_QUEUE_SIZE = 50;
-const METADATA_RETRY_DELAY_MS = 2_000;
 const RPC_RETRY_DELAY_MS = 1_000;
 
 const requestDeadlineMs = 15_000;
@@ -419,12 +417,6 @@ export class TbankClient {
     ).then((response) => response.lastPrices ?? []);
   }
 
-  getLastPrice(token: string, uid: string): Promise<null | TbankLastPrice> {
-    return this.getLastPrices(token, [uid]).then(
-      (prices) => prices.find((item) => item.instrumentUid === uid) ?? null,
-    );
-  }
-
   getTradingStatus(token: string, uid: string): Promise<null | string> {
     return this.call<{ tradingStatus?: string }>(
       token,
@@ -486,8 +478,7 @@ export class TbankClient {
     request: object,
   ): Promise<Response> {
     const metadataCall = method === 'getInstrumentBy';
-    const maxAttempts = metadataCall ? METADATA_MAX_ATTEMPTS : RPC_MAX_ATTEMPTS;
-    for (let attempts = FIRST_ATTEMPT; attempts <= maxAttempts; attempts += ATTEMPT_INCREMENT) {
+    for (let attempts = FIRST_ATTEMPT; attempts <= RPC_MAX_ATTEMPTS; attempts += ATTEMPT_INCREMENT) {
       const startedAt = performance.now();
       const queueFull = this.queue.size >= MAX_QUEUE_SIZE;
       try {
@@ -508,34 +499,25 @@ export class TbankClient {
         const failureContext = queueFull
           ? { code: TbankErrorCode.Unavailable }
           : { grpcCode };
-        const retryable = queueFull
-          ? metadataCall
-          : [
-              status.DEADLINE_EXCEEDED,
-              status.RESOURCE_EXHAUSTED,
-              status.UNAVAILABLE,
-            ].includes(grpcCode);
-        if (retryable && attempts < maxAttempts) {
+        const retryable = !queueFull && [
+          status.DEADLINE_EXCEEDED,
+          status.RESOURCE_EXHAUSTED,
+          status.UNAVAILABLE,
+        ].includes(grpcCode);
+        if (retryable && attempts < RPC_MAX_ATTEMPTS) {
           this.logger.event('warn', 'tbank.rpc.retry', {
             operation: method,
             ...failureContext,
             attempts,
             durationMs: Math.round(performance.now() - startedAt),
           });
-          await new Promise((resolve) =>
-            setTimeout(
-              resolve,
-              metadataCall
-                ? attempts * METADATA_RETRY_DELAY_MS
-                : RPC_RETRY_DELAY_MS,
-            ),
-          );
+          await new Promise((resolve) => setTimeout(resolve, RPC_RETRY_DELAY_MS));
           continue;
         }
         this.logger.event('error', 'tbank.rpc.failed', {
           operation: method,
           ...failureContext,
-          attempts: queueFull && !metadataCall ? NO_RPC_ATTEMPTS : attempts,
+          attempts: queueFull ? NO_RPC_ATTEMPTS : attempts,
           durationMs: Math.round(performance.now() - startedAt),
         });
         if (