fix(cursor): retain last-good model cache#130
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This was referenced Jul 10, 2026
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Replaces the model-cache slice of contributor PR #124 with safe per-auth last-good snapshots. A transient discovery failure returns an isolated deep copy of the last successful catalog; cold start retains the existing fallback without overwriting live data.
Contributor provenance: retains the intent from tan-yong-sheng commits 69d09fe and c996e20, with maintainer repairs for full deep copy and failure behavior.
Validation: focused race tests covering cold start, success, repeated failures, reader/writer nested mutation isolation, concurrent auths, full go test, server build, and independent re-review.
Refs #124