workbook_range_digest

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Spreadsheet-range digest only; NOT the general artifact emitter (use emit_chaingraph_artifact to wrap arbitrary computation output — this tool's as_artifact mode covers whole-sheet workbook runs only). Evaluates the supplied cells (same evaluator as workbook_evaluate) and computes a canonical values_digest over one A1-style range (e.g. "B2:D9") -- the exact `executionHash(values, {})` path the rest of OCG uses, per chaingraph/workbook/INPUT-MANIFEST.md (WB-2). Returns one `ranges[]` fragment of the Spreadsheet Input Manifest schema; assemble the full manifest (source.csv_digest, produced_by/produced_at) around it. Same range digested from the same cells in the tools/554 browser workbook always produces the same values_digest -- unless as_artifact is true, in which case it returns a full OCG v0.4 artifact over the WHOLE sheet instead of a single-range fragment (see as_artifact).