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T03: specs/CostAccounting.md — 15 contracts, 8 metrics, each with a command

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Normative spec for the cost model (dedup by requestId, per-model and
per-TTL pricing), the attribution contract (ending-at-commit intervals
scoped by sessionId), and the reported shape (composition, not a total).

Every acceptance row names the command that produces its number, per
InnerLoop Step 4. AC-5..AC-8 are the positive control: cb-cost
--self-test must fail on a dedup violation, on zero responses, on a
missing subagent tree, and on 5m cache priced at the 1h rate.

The feasibility check earns its place here: AC-1's $92.87 is reachable
only if CA-06 holds. The earlier $92.21 target was reachable only by a
collector with the exact blind spot the survey documented.

MetricsAndScenarios 1a superseded. Two of its rules struck through
rather than deleted, because both were wrong in instructive ways: "if
the cache split is unknown, count all input at full price" would have
priced 80.5M cache reads at 10x, and "the hub already records tokens"
named as a source what is only ever a lossy sink. M-D2-TOK demoted --
tokens are not comparable across models or cache states.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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workplans/CB-WP-0002-cost-accounting.md
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@ -113,7 +113,7 @@ Gate: no collector code before this ADR is committed.
```task
id: CB-WP-0002-T03
status: todo
status: done
priority: high
state_hub_task_id: "00d42ed2-4391-4580-aae2-06e3e151c69b"
```