- Added `variant-collapse.ts`: hand-table collapsing for providers exposing one logical model as several effort/thinking-suffixed upstream ids (Antigravity CCA `gemini-3.5-flash-extra-low`/`-low`/`gemini-3-flash-agent`, `gemini-3[.1]-pro-low|high`, `claude-*[-thinking]` pairs, `gpt-oss-120b-medium`) plus the automatic `X`/`X-thinking` pair rule (`deriveThinkingPairFamilies`), gated on same api and compatible pricing; exported from the package barrel and covered by `variant-collapse.test.ts`.
- Added `ThinkingConfig.effortRouting` and `suppressWhenOff` to `types.ts`, and `resolveWireModelId(model, effort)` to `model-thinking.ts` so request-time code resolves the outbound wire id while selection, caching, and usage attribution key on the logical id.
- Wired collapsing at every materialization point: Antigravity discovery (`collapseEffortVariants`, dropping `gemini-2.5-flash-thinking`/`gemini-3-pro-low` from the discovery denylist), the model-manager merge and cache paths (`collapseBuiltModelVariants`), and the catalog generator post-pass (`collapseEffortVariantsAcrossProviders`).
- Exempted collapsed specs from `applyGeneratedModelPolicies` re-derivation via `isVariantCollapsedSpec`, bumped the model cache schema to v5 to invalidate rows carrying raw member ids, and changed the `google-antigravity` default model from `gemini-3-pro-high` to `gemini-3.1-pro`.
- Recorded the catalog changelog block; its display-name-cleaning entry and the adjacent `cleanModelName` import in `generate-models.ts` belong to the upcoming name-cleaning commit but share contiguous changed runs with this one.
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