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refactor(token-meter): fold the surface once for the meter and the projection

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`contextBreakdown.messageTokens` and `measure().surfaceTokens` answer the same
question in the same heuristic vocabulary, and the panel's composition rows are
only honest while they agree. Each owner carried its own copy of the positional
fold — same pricing, same `{seq, tokens}` node list, same replace-range lookup
and guard, differing only in mutable versus immutable application — so an edit
to either one would have moved the panel away from `measure()` with both sides
still green. The duplication gate caught the shared 62 tokens.

`src/surface-fold.ts` now owns `foldSurfaceTokens`: total, allocation-fresh,
returning the event's price, the next surface, and the signed total delta. The
service assigns that result where it used to prepare a commit closure, which
keeps its validate-before-mutate replay transaction intact — the fold throws
before any state is touched, so a malformed event still fails identically on
every retry. `_prepareSurfaceMutation` and `_estimateSurfaceEvent` go away with
it, and the projection's apply drops to one call.

Covers the identity with a session that appends and then compacts, asserting
the projection figure equals the service surface at each boundary; the test
fails when either side of the fold is perturbed.
This commit is contained in:
Yichen Jiang
2026-08-05 16:29:51 +08:00
parent 46562b2c30
commit e62cbe12e4
12 changed files with 138 additions and 100 deletions
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.agents/notes/implemented/feature/2026-08-05-composer-context-meter-breakdown.i18n.yaml
+2 -2
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@@ -2,5 +2,5 @@
# side as of the last confirmed-consistent state. Both languages carry equal authority;
# after editing either side, bring the other along and re-record with:
# pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-08-05-composer-context-meter-breakdown.md
2026-08-05-composer-context-meter-breakdown.md: 431415f8463471f076df8f19e6c853909484f295
2026-08-05-composer-context-meter-breakdown.zh.md: 71eea5fa657418297d49fbc0827bdd933b279c2d
2026-08-05-composer-context-meter-breakdown.md: 299d6d7202c43138aa1c5bd8b45431eff437ebb1
2026-08-05-composer-context-meter-breakdown.zh.md: caff48206aaa8e6cdbc3f56007b525388834794c