feat(p7): AI tables + enums + migration + events + InferencePort contract
Task 7.1: 7 AI-proposal-layer tables (IiosAiJob, IiosAiModelRun, IiosAiArtifact,
IiosAiClaim, IiosAiEvidenceLink, IiosAiToolCall, IiosEmbeddingRef) + enums;
migration ai-init. Adds ai.job.created / ai.artifact.proposed / ai.artifact.accepted
events and a standalone InferencePort contract (not part of sealed IiosPlatformPorts).
resetDb truncates the new tables.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
maaz519
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