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Hypatia May
58a0e450b3
foldSurfaceTokens rebuilt the priced surface on every surface event: an append allocated [...nodes, node] and a replacement copied the whole array before splicing, charging every well-formed event O(surface) for an atomicity property only malformed events need. Benchmarks put the copy at ~99.9% of an append's cost (100µs at a 50k-node surface vs 0.1µs for pricing) with O(S²) accumulation over a session, inside the synchronous session/event publication path. Split the fold into the session core's planSurfaceEvent/applySurfacePlan shape: planSurfaceTokens performs every fallible step against the read-only surface, commitSurfaceTokens applies the plan in place and is infallible by construction. _foldEvent plans first, runs the remaining fallible anchor validation, and only then commits, so retry identity is preserved by ordering instead of by allocation. Appends drop to amortized O(1) (100.3µs -> 1.9µs at 50k nodes); replacements keep their O(surface) findIndex but stop paying the extra full copy (21µs -> 4.2µs). A new regression test pins the one hazard this introduces: an event whose surface plan is valid but whose later anchor validation throws must leave the priced surface and running total uncommitted across repeated failures.