resolveModel lowercases input and strips one trailing [...] context marker.
Opus 4.7, Opus 4.8 and Sonnet 5 keep their pinned overlay only for the bare
ID, the bare ID plus an 8-digit date, and the bare ID plus -latest; any other
suffix (point releases such as claude-sonnet-5-5, claude-opus-4-7-1) falls to
the generic claude overlay. claude-opus-5-5 routes to claude explicitly (no new
overlay, no new ALL_MODEL_NAMES entry). Fable keeps its prefix match while
CLAUDE_FRONTIER_EVAL_MODEL is claude-fable-5-1, guarded by a test.
Tests: one test/model-overlays.test.ts case per shape in the plan, plus the
lowercase / [1m] marker / family-name cases and the Fable guard.
garrytan
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