fix(usage): no confident price for partly measured usage

[vadymhimself]

Summary

• Cost estimates no longer price partly measured usage. estimateAttemptCost and estimateRequestCost (src/usage/cost.ts) priced any usage that was present, whatever its usageStatus. A combo row whose first leg failed without usage is unreported (aggregateAttemptUsage) but still carries the second leg's tokens, so it got an understated cost presented as complete. That affected the Logs ~$ value, routing-analytics success cost (successCostUsd), and the per-model and per-provider cost attribution in /api/usage. Both estimators now return null unless the status is reported or estimated. The existing isMeasuredStatus helper moves from summary.ts to cost.ts so both files share one definition.
• The priced and unpriced request counters no longer count one request twice. bumpRequestCounts (src/usage/summary.ts) incremented both pricedRequests and unpricedRequests when a request's attempts on one model split between priced and unpriced. That made priced + unpriced > requests and overstated priceCoverageRatio. Now a request counts as unpriced if any attempt is unpriced.
• When a usage-less attempt counts as zero cost. If an attempt carries no usage, spentNothing (src/usage/summary.ts) decides whether it is a known zero or an unknown cost:
  • No physical send (sendCount === 0 or locallyAnswered): zero. Nothing reached upstream.
  • Refused before any output (status >= 400, not streamAborted, no firstOutputMs): zero. Providers do not bill a request rejected with an HTTP error before generation (429/401/403/400/413/5xx with an error body). Without this, every pool-rotation or failover retry after a 429 would drop out of price coverage. requestSpendRecord's settled count is send-budget accounting, not money, so it doesn't contradict this.
  • Response began, or status is not an error (streamAborted, firstOutputMs set, or a 2xx/unknown status with no usage frame): unpriced. Such an attempt may have generated billed tokens, e.g. a mid-stream failure. One of these makes the whole request unpriced.
  • Only no-cost attempts: the request still counts as unpriced, as before.
• Request-level totals: computeEntryCost now makes the row unpriced when a usage-less attempt is not a known zero. A non-combo retry row reads reported from its served leg, so before this change an earlier leg that died mid-stream left the total understated but confident. An attempt that has usage but no matching price keeps upstream's pinned behaviour: the priced remainder is still totalled (combo-mixed-pricing test).
• Docs: docs-site/.../guides/web-dashboard.md (excluded-request semantics) and structure/dashboard-and-usage.md (owning doc for src/usage/).

Verification

• Red first on clean upstream/dev (0b13396af), using a detached worktree with only the new test file copied in: bun test tests/usage/usage-cost.test.ts gave 102 pass, 4 fail. The 4 new tests failed:
  • partly measured usage was priced;
  • a mixed priced/unpriceable request was counted priced;
  • no-send, local, and 429-refused legs before a served retry were counted on both sides;
  • stream-aborted, output-began, and silent-200 legs were counted on both sides.
• Green: bun test tests/usage/ gave 1126 pass, 0 fail. This includes the CodeRabbit follow-up regression "a retry row reported from its last leg does not total a cost an earlier leg may have added", which fails before b83e2d70c.
• tests/usage/usage-summary.test.ts "row-unique overflow folds a multi-model request only once" had pinned the old double count (pricedRequests: 1, unpricedRequests: 1). Its second attempt has status 200, sendCount: 1 and no usage, so under the new rule it now expects pricedRequests: 0, unpricedRequests: 1.
• bun run typecheck: clean.
• bun run test:changed was last run on the previous revision of this branch. The final revision only changes spentNothing and its tests. Result: 30439 pass, 39 skip, 11 fail, 3 errors. The failures are in tests/cli/cli-access-audio-live.test.ts, tests/service/service-sqlite-home.test.ts, tests/service/service.test.ts and tests/cli/cli-connect-readiness.test.ts. The first three pass in isolation on both this branch and clean upstream/dev, so they are load-dependent. cli-connect-readiness ("a rejected preferred runtime falls back…") also fails on clean upstream/dev. None of these files imports src/usage/cost.ts or src/usage/summary.ts.
• bun run structure:check: passed. bun run privacy:scan: passed. docs-site: bun run build completed.
• No GUI change.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

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[vadymhimself]

@coderabbitai review

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📝 Walkthrough

Cost estimates now require reported or estimated usage. Request pricing coverage distinguishes attempts known to have spent nothing from attempts that may have been billed.

Changes: Usage accounting

Layer / File(s)	Summary
Measured usage and cost estimation src/usage/cost.ts:400-408, 580, 668, src/usage/summary.ts:13, 431-434, tests/usage/usage-cost.test.ts:768-781	isMeasuredStatus is shared by cost estimation and usage summaries. Attempt and request estimates return null for unreported or unsupported usage, including when token data is present.
Request pricing coverage src/usage/summary.ts:813-834, 1570, tests/usage/usage-cost.test.ts:28-29, 783-820, tests/usage/usage-summary.test.ts:1961, structure/dashboard-and-usage.md:293, docs-site/src/content/docs/guides/web-dashboard.md:206-210	Attempts known to have spent nothing do not add an unpriced fact. A request counts as priced only if it has a priced fact and no unpriced fact. Tests and documentation describe these rules; the overflow test now expects zero priced requests for the collapsed row.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Suggested reviewers: lidge-jun

Merge Risk: 🟡 Moderate · up to ff907

Usage summaries can show an understated cost for requests with a potentially billed but unpriced attempt. Correct the aggregation before merging.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 4 files. (2 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title accurately summarizes the main change: prevent pricing for partially measured or otherwise untrusted usage data. It is concise, specific, and directly related to the cost-estimation and requ…

Full details: Docstring Coverage

Explanation

Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 4 files. (2 skipped: 2 unsupported.)

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/usage/summary.ts:
- Around line 831-834: Update the attempt-cost aggregation feeding
REQUEST_PRICED and REQUEST_UNPRICED to track whether any null estimate is not
covered by spentNothing; count a request as priced only when it has an estimate
and no such unknown-cost attempt. Keep usage-less attempts covered by
spentNothing eligible as known zero, and make the result independent of attempt
order.

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📥 Commits

Reviewing files that changed from the base of the PR and between 0b13396 and ff9075d.

📒 Files selected for processing: 6

• docs-site/src/content/docs/guides/web-dashboard.md
• src/usage/cost.ts
• src/usage/summary.ts
• structure/dashboard-and-usage.md
• tests/usage/usage-cost.test.ts
• tests/usage/usage-summary.test.ts

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[lidge-jun]

Being carried into #7225 with your authorship preserved; this PR will be closed when the bundle lands.

[lidge-jun]

Landed on dev in 300e426 via #7225 (your change is its own commit in that bundle, and the squash keeps your authorship as Co-authored-by). Thank you!