SMOODEV-groq-deprecation: rename removed Groq Llama aliases to gpt-oss

[brentrager]

Problem

The smooai litellm gateway (PR #2097, merged) deleted the deprecated Groq aliases groq-llama-3.3-70b and groq-llama-3.1-8b. The smooth repo's smooth-judge / smooth-fast semantic slots still routed to those names, so they would return HTTP 400 / 404 once the gateway redeploys.

The rename

• groq-llama-3.3-70b → groq-gpt-oss-120b (judge / reasoning slot)
• groq-llama-3.1-8b → groq-gpt-oss-20b (fast slot)

No groq-llama-4*, groq-kimi*, or qwen3-32b references exist anywhere in the repo (verified).

Changes

• smooth-policy/src/smooth_alias.rs (source of truth): concrete_default() for Judge/Fast → gpt-oss; doc mapping table + tests updated. Added a second migration step migrate_deprecated_concrete(): a config that already ran the smooth-* → concrete migration is pinned to the literal dead Groq name (no smooth- prefix left to re-trigger the slot map), so it would otherwise stay on a dead model. The step rewrites the dead concrete names → gpt-oss. This flows through every consumer (migrate_alias is the shared entry point) — no new mechanism invented.
• smooth-cast/src/provider_migration.rs: slot/rewrite test expectations updated; new test migrate_bumps_already_migrated_groq_llama_to_gpt_oss proving an already-migrated registry gets bumped + idempotent.
• smooth-code/src/model_picker.rs: offline catalog entries + fallback/post-migration test expectations renamed.

Historical CHANGELOG.md entries left intact (they describe a past release).

Validation

• cargo check / cargo fmt --check clean for all three crates.
• cargo test -p smooai-smooth-policy -p smooai-smooth-cast -p smooai-smooth-code — all green (incl. 2 new tests).
• Pre-existing unrelated smooth-pearls clippy sort_by_key error is on main too (not touched here).

⚠️ Deploy ordering

Do NOT merge/deploy this before coordinating. smooth deploy must precede the litellm gateway redeploy that removes the old aliases — otherwise in-flight configs still on smooth-judge/smooth-fast briefly map to dead names. Main session reviews + coordinates.

🤖 Generated with Claude Code

https://claude.ai/code/session_01AxL4LdeChNivUCZM6No2NJ

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