Why: the U6 admission test imported agent-intent directly from
internal/server, which lint-boundaries forbids (only intentgate,
intentsem and the squad intent adapter may import it).
Evidence: repair receipt success; server/intentgate/route tests pass
(verify-u6r.json); fixtures moved behind intentgate helpers.
Impact: test-only rework plus a small intentgate fixture helper.
Refs: feature/agent-stack-audit-remediation-b1 U6 repair
weichen
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