contextBreakdown kept one entry per retained surface node, so its
checkpoint grew with the message count (7.13 MB across 836 local Sessions,
up to 103 KB for one) and every cached Session listing validated it. The
state now holds the surviving system prompts, one surface total, and at
most one shadow-price claim. Appends add their price; a replacement
subtracts the adjacent compaction/summary or compaction/prune price and
drops the system prompts its shadowedSeqs name; a system-prompt rewrite
subtracts the retained prompt price. Other unmetered replacements fold at
zero delta, as in contextPressure. State version 6 discards positional
rows. Folding all 836 local logs with both versions gives identical
figures after every event; retained state drops to 110 KB.
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