Person/group columns store a numeric LookupId into each site's hidden User Information List, and SPO's ensureUser needs certificate auth that client secrets can't provide — so resolve by querying the hidden list directly via Graph (item id IS the LookupId). New resolvePersonByEmail() in graph.mjs (server-side EMail/UserName filter with a paged case-insensitive scan fallback), a 'person' CLI command, and a sharepoint_resolve_person MCP tool (9 tools now). Verified live against known ground truth (LookupIds 53 and 136) plus the not-found path. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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