- BLOCKING: reorder resolveProviderCredentialIdentityKey so email
identity takes priority over project — two users with different
emails on the same GCP project no longer get merged/hard-deleted.
- Added #getUsageReportScopeProjectId helper so Gemini CLI reports
(which set projectId on limit.scope but not metadata) still get
dedup coverage. Both metadata and scope projectId paths checked.
- formatAggregateAmount now falls back to limits.length when no
scope.accountId values are present, preserving pre-existing
behaviour for providers that don't set accountId on limits.
- Added 9 contract tests for the antigravity usage merge logic:
tier dedup, worst-fraction-wins, mixed-case collapsing,
reset-time-from-other-entry, windowId separation, metadata,
sort order, and null-on-no-project.
- Nits: label='Usage' (so formatLimitTitle renders 'Usage (Default)'
not bare 'Default'), id uses params.provider instead of hardcoded
string, tier field drops redundant ?? undefined.
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