fix(agents): stabilize overflow compaction retries and session context accounting (openclaw#14102) thanks @vpesh

Verified:
- CI checks for commit 86a7ecb45e
- Rebase conflict resolution for compatibility with latest main

Co-authored-by: vpesh <9496634+vpesh@users.noreply.github.com>

src/cron/isolated-agent/run.ts

@@ -456,6 +456,7 @@ export async function runCronIsolatedAgentTurn(params: {
   // Update token+model fields in the session store.
   {
     const usage = runResult.meta.agentMeta?.usage;
+    const promptTokens = runResult.meta.agentMeta?.promptTokens;
     const modelUsed = runResult.meta.agentMeta?.model ?? fallbackModel ?? model;
     const providerUsed = runResult.meta.agentMeta?.provider ?? fallbackProvider ?? provider;
     const contextTokens =
@@ -479,6 +480,7 @@ export async function runCronIsolatedAgentTurn(params: {
         deriveSessionTotalTokens({
           usage,
           contextTokens,
+          promptTokens,
         }) ?? input;
     }
     await persistSessionEntry();