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### What problem does this PR solve? Incremental Wiki compilation could lose provenance for claim-light entities, produce unstable page groups across embedding models, route entities to unrelated pages, and assign topics without sufficient page-level context. Document removals and page membership changes could also leave stale Wiki state. This PR: - preserves source document and chunk provenance throughout entity matching, reduction, page generation, and deletion; - uses embeddings to retrieve candidates and the LLM to make final page grouping and incremental routing decisions; - batches embedding and LLM operations with bounded concurrency and deterministic fallbacks; - selects source-scoped topic candidates with embeddings before the page LLM chooses the final topic; - rebuilds Wiki state when the compilation mode or embedding model changes; - normalizes Wiki array fields returned by the API and retains entities without relations in graph responses. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue)