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## Why Saved model selections can outlive their catalog entries. Removing GPT-5.4 needs to preserve a migration path without applying it to other providers that may still support the same model slug. ## What changed - Remove `gpt-5.4` from the bundled catalog and `openai.gpt-5.4` from the Bedrock catalogs, including GovCloud. - Add fallback migration prompts to GPT-6 Sol for saved GPT-5.4 selections on OpenAI and Amazon Bedrock. Scope fallback migrations, including the existing GPT-5.4 Mini migration, to their owning providers while honoring catalog metadata. - Update tests that depend on bundled GPT-5.4 metadata to use GPT-5.5 or explicit model overrides. ## Testing Extend migration tests to cover catalog metadata precedence, acknowledged targets, missing or hidden replacements, and preserving the provider while saving the replacement model and its default reasoning effort. Update Bedrock catalog assertions and picker snapshots. GitOrigin-RevId: f739795da423b9622db2a416be6c52b01b8e7a71