Migrate DeepSeek routing to V4.1 Flash

[erinepshovel-code]

Summary

• make deepseek-flash the canonical DeepSeek V4.1 Flash route
• collapse the former V4 Flash/Pro presets onto the current Flash endpoint
• keep deepseek-pro and the retired V4 model slugs as hidden compatibility aliases that canonicalize before dispatch
• update peak token pricing, cache pricing, vision/context/output metadata, and reasoning-effort mappings
• preserve the shared OpenAI-compatible adapter; no provider-specific DeepSeek adapter is introduced
• send reasoning.effort=none explicitly for providers that require it

DeepSeek retires the distinct deepseek-v4-pro route at 2026-09-14 04:00 UTC. Official references: DeepSeek updates and pricing/model table.

Compatibility and rollout

• Existing A0_PROVIDER=deepseek-pro, persisted deepseek-v4-pro, and earlier Flash aliases continue to work, but resolve to canonical deepseek / deepseek-flash.
• The legacy Pro choice is hidden from the model catalog and no longer carries a workspace-tier gate.
• OpenAI and xAI routes are unchanged and remain available as rollback routes.
• No credentials, provider accounts, or subscriptions are changed.

Verification

• uv run pytest -q tests/test_open_comp_prov_v0.0.0alpha.py tests/test_open_comp_rout_v0.0.0alpha.py tests/test_aone_open_comp_adap_v0.0.0alpha.py tests/test_appr_tool_disp_v0.0.0alpha.py tests/test_a0_package.py
• Result: 104 passed
• OpenAI-compatible contract witness passed.
• Full repository collection was also attempted; it is blocked by pre-existing environment requirements for edcm_org and DATABASE_URL, before test execution.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-10T23:05:00.198774Z	01c6f88	Manual request

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[erinepshovel-code]

@codex review exact head e50c402

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@codex review exact head 01c6f88

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Codex Review: Didn't find any major issues. Keep them coming!

Reviewed commit: 01c6f8897e

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