feat(models): add Gemini 3.5 Flash and Flash Lite to LLMType (release with backend #3070 deploy)

[John Xing (johnxing-amigo)]

Hold: release with the backend #3070 deploy. Merge and release only after backend #3070 is live on api.amigo.ai. Drop the title suffix at squash time, because the subject becomes the changelog line.

Backend #3070 adds google_gemini-3.5-flash and google_gemini-3.5-flash-lite to LLMType and keeps the 2.5 ids. On 2.0.1, LLMConfigInput(llm_name="google_gemini-3.5-flash") raises a ValidationError client-side, so nobody can pin 3.5 through the SDK.

flowchart LR
  A[backend #3070 deploys<br/>2.5 + 3.5] --> B[this PR: amigo_sdk minor<br/>2.5 + 3.5]
  B --> C[backend #3071 deploys<br/>drops 2.5]
  C --> D[follow-up release<br/>drops 2.5]

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What changes

• specs/openapi-baseline.json: two values appended to components.schemas.LLMType.enum. Nothing else in the snapshot moves.
• src/amigo_sdk/generated/model.py: regenerated with scripts/gen_models.py. Only LLMType.google_gemini_3_5_flash and google_gemini_3_5_flash_lite are new.
• tests/test_current_contract_models.py: LLMConfigInput accepts both 3.5 ids.

Review

• The enum matches #3070's lib/amigo_lib/llm/llm.py in values and order.
• Don't ship the #3071 shape (no 2.5) until #3071 is in prod. 2.0.1 users pinning 2.5 would start failing client-side validation while the backend still accepts it.

Test plan

• ruff check ., ruff format --check ., mypy src/amigo_sdk/
• pytest: 202 passed, 8 skipped, 88.46% coverage
• After #3070 is in prod: confirm curl -s https://api.amigo.ai/v1/openapi.json | jq .components.schemas.LLMType.enum lists both 3.5 ids, then merge
• gh workflow run release.yml --repo concurrence-hq/amigo-python-sdk --ref main -f version_type=minor. Leave regenerate_models=false so it ships the committed models. The auto path waits on backend notify-sdk pointing at concurrence-hq.

Rollout: PyPI minor (2.1.0) via manual release.yml. Roll back by yanking the version and releasing a revert.

Not in this PR: repository and docs URLs (#60, Caly), and the post-#3071 release that removes 2.5.

[blacksmith-sh]

Found 27 test failures on Blacksmith runners:

Failures

Test	View Logs
TestConversationIntegration/test_create_conversation_streams_and_returns_ids	View Logs
TestConversationIntegrationSync/test_create_conversation_streams_and_returns_ids	View Logs
TestConversationIntegrationSync/test_create_conversation_streams_and_returns_ids	View Logs
TestOrganizationIntegration/test_get_organization	View Logs
TestOrganizationIntegration/test_get_services	View Logs
TestOrganizationIntegrationSync/test_get_organization	View Logs
TestOrganizationIntegrationSync/test_get_organization	View Logs
TestOrganizationIntegrationSync/test_get_services	View Logs
TestOrganizationIntegrationSync/test_get_services	View Logs
TestUserIntegration/test_create_user	View Logs

...and 17 more test failures. View all on Blacksmith

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