Merge remote-tracking branch 'origin/token-meter-service' into compact-post-step-overflow-recovery
# Conflicts: # docs/core-data-structures/compaction.md # docs/rfc/implemented/architecture/2026-07-15-replay-token-meter-service.i18n.yaml # docs/rfc/implemented/architecture/2026-07-15-replay-token-meter-service.md # docs/rfc/implemented/architecture/2026-07-15-replay-token-meter-service.zh.md # docs/rfc/implemented/feature/2026-06-18-compaction-capability-seam.md # examples/coding-agent/cordis.yml # packages/compact/compact-basic/README.md # packages/compact/compact-basic/src/automatic.ts # packages/compact/compact-basic/src/config.ts # packages/compact/compact-basic/src/index.ts # packages/compact/compact-basic/tests/compact-basic.spec.ts
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@@ -25,9 +25,9 @@ Both methods are **abstract** — the backend owns trigger policy, retention, ev
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## Tool-pairing boundaries
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The interface exports `toolPairingBalancedBefore(session, node)` and `toolPairingBalancedAfter(session, node)` for snapping and validating compaction edges. A safe edge has no unanswered assistant tool call crossing it. Each helper validates the node's seq against current surface membership and resolves the trailing edge from its cached positional successor, so a stale caller-held `node.next` cannot choose the cut.
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The interface exports `toolPairingBalancedBefore(session, node)` and `toolPairingBalancedAfter(session, node)` for snapping and validating compaction edges. A safe edge has no unanswered assistant tool call crossing it. Each helper identifies the node by seq alone and answers from balances cached per cut in current surface order, so a stale caller-held `node.next` cannot choose the cut.
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The private per-session cache is keyed by `session.surface.replaceGeneration` and the processed surface-node count. An unchanged generation extends the fold with unseen tail nodes only; a log-only append with no new surface node does no event reads, while a replacement generation rebuilds current membership, successors, and balances. Missing event seqs and a `tool/result` without a preceding open call reject as corrupt surface state.
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The private per-session cache is keyed by `session.surface.replaceGeneration` and the processed surface-node count. An unchanged generation extends the fold with unseen tail nodes only; a log-only append with no new surface node does no event reads, while a replacement generation rebuilds current membership and balances. Missing event seqs and a `tool/result` without a preceding open call reject as corrupt surface state.
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## Surface contract
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