chore(sdkx/llm/deepseek): annotate legacy aliases with ModelDeprecation#54
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`deepseek-chat` and `deepseek-reasoner` are legacy aliases that DeepSeek
will fully retire on 2026-07-24 15:59 UTC, per the V4 Preview release
note (api-docs.deepseek.com/news/news260424). Until now we only described
this in package comments, so the resolver had no structured signal and
could not emit the one-shot deprecation warning that other providers
(e.g. openai/o4-mini) already produce.
Populate `ModelInfo.Deprecation` on both aliases so the resolver telemetry
fires consistently:
- RetiresAt: 2026-07-24 15:59 UTC (shared via legacyAliasRetiresAt)
- Replacement: deepseek/deepseek-v4-flash (official routing target for
both non-thinking and thinking modes)
- Notes: link to news/news260424 plus the routing mode
The pinned-minute precision mirrors the upstream announcement; the
warning formatter ignores HH:MM:SS per ModelDeprecation docs.
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Summary
sdkx/llm/deepseekpreviously described the upcoming retirement of thedeepseek-chatanddeepseek-reasoneraliases only in package comments,so
ModelInfo.Deprecationwas empty and the resolver could not emit theone-shot deprecation telemetry that other providers (e.g.
openai/o4-mini)already produce.
Deprecationon both alias entries with the official shutdownmoment (
2026-07-24 15:59 UTC, shared via a new package-levellegacyAliasRetiresAt), the official routing target(
deepseek/deepseek-v4-flash), and a link to the upstream announcement.formatter ignores
HH:MM:SSperModelDeprecationdocs, so behaviouris unchanged for downstream telemetry.
Test plan
cd sdkx && go vet ./llm/deepseek/...cd sdkx && go build ./llm/deepseek/...deepseek/deepseek-chat(ordeepseek-reasoner) once in asandbox process and confirm the one-shot deprecation warning is logged.
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