[codex] Harden context compression history handling (#848)
* Use token threshold for chat compression * Add compression settings controls * Use config for chat compression * Cover protected messages in compression tests * Remove message-count compression limit * Harden compression window fallback * Rebuild stale compression snapshots * Harden stale compression snapshots * Update changelog for compression hardening * Prefer local history session details
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@@ -38,7 +38,7 @@ export async function loadSessionStateFromDb(sid: string, _sessionMap: Map<strin
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let inputTokens: number
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let outputTokens: number
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const snapshot = getCompressionSnapshot(sid)
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if (snapshot) {
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if (snapshot && snapshot.lastMessageIndex >= 0 && snapshot.lastMessageIndex < messages.length) {
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const newMessages = messages.slice(snapshot.lastMessageIndex + 1)
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const newUsage = estimateUsageTokensFromMessages(newMessages)
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inputTokens = countTokens(SUMMARY_PREFIX + snapshot.summary) +
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