Why: I1 WP6 - eval needs per-turn command expectations to carry the
SetSlot+Start acceptance case, and corpora must reproduce standalone
in intentctl (the guard case has been red there since before I1
because the guard spec only existed as a test builtin).
Evidence: go vet clean; go test ./... all ok; intentctl eval passes
11/11 on the v1 corpus (guard case fixed via self-declaration) and
1/1 on the new two-turn SetSlot+Start corpus.
Impact: new intent/corpus.go (CorpusCase/CorpusTurn/CommandExpect,
RunCorpusCase with chained expectations); intentctl eval consumes
turns and corpus-declared builtin_specs and domains; report.generate
spec and corpus_multiturn.json fixtures added. v1 corpus format and
conformance unchanged.
Refs: Documents proposal 2026-10-07-agent-stack-n1q1i1-plans.md I1 WP6
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