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@@ -43,7 +43,7 @@ An empty head with no active later system node represents no prompt. Dormant emp
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Web presents an appended in-history node at its own position. `SystemPromptNode` carries `{ seq, time, turn, step, text, update }`, `update` being true for an appended `system/message` that follows an earlier system node in the loaded window. Chat renders a non-empty update as a collapsed `system-prompt` card titled by the locale key `message.systemPromptUpdate`, and a `request/header` in the same turn and step does not repeat the prompt card; `inspectRequestPrompt` reports no system change for a header that follows an update. Trajectory folds an update following a loaded request header into a synthetic request-header fact with `promptChange.kind = 'system'`, so later requests show the effective prompt without a real header change. When the loaded window lacks the earlier system node, the update is presented as an initial prompt. Transcript projections skip it like every `system/message`.
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-`dsh-token-meter` prices the last nonempty surviving system node in surface order as `contextBreakdown.systemTokens`; every other visible node, including superseded prompts, contributes to `messageTokens`. Empty dormant nodes are ignored. The sum equals the fixed-heuristic surface total after every replacement, whether or not a shadow-price claim exists. Compact retained entries reuse the measurement surface planner: state and transitions cost O(current retained surface), not O(1) or O(total historical log). Replaced entries and message bodies are discarded, and state version 3 rejects scalar checkpoints. `cacheReadTokens` on subsequent assistant usage remains the observable provider-cache effect.
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+`dsh-token-meter` prices the last nonempty surviving system node in surface order as `contextBreakdown.systemTokens`; every other visible node, including superseded prompts, contributes to `messageTokens`. Empty dormant nodes are ignored. The sum equals the fixed-heuristic surface total after every replacement, whether or not a shadow-price claim exists. Compact retained entries reuse the measurement surface planner: state and transitions cost O(current retained surface), not O(1) or O(total historical log). Replaced entries and message bodies are discarded, and state version 4 rejects scalar checkpoints. `cacheReadTokens` on subsequent assistant usage remains the observable provider-cache effect.
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Trajectory chooses the newer of the preceding real header and the preceding synthetic system header as the comparison state. A real header owns configuration and tools; an appended prompt can advance that state without another real header. Comparing only real headers would report A rather than B as the previous prompt for an A → B → C sequence.
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Tianyi Cui