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refactor: replace Object.hasOwn guards with Object.create(null) at map creation sites

Instead of patching every lookup with Object.hasOwn, fix the root cause by
creating all internal lookup maps with null prototypes so there are no
inherited properties to collide with.

Creation sites updated (prefixes, VALUES mappings, graph-grouping, rule maps):
- packages/rules-sparql-1-1/lib/MinimalSparqlParser.ts
- packages/rules-sparql-1-2/lib/parserUtils.ts
- engines/parser-sparql-1-2/lib/Parser.ts
- packages/algebra-transformations-1-1/lib/toAlgebra/core.ts
- packages/rules-sparql-1-1/lib/grammar/whereClause.ts
- packages/algebra-transformations-1-1/lib/toAst/updateUnit.ts
- packages/core/lib/parser-builder/parserBuilder.ts
- packages/core/lib/indirection-builder/helpers.ts
- packages/core/lib/indirection-builder/IndirBuilder.ts
- packages/core/lib/generator-builder/generatorBuilder.ts

All Object.hasOwn guards introduced in the previous two commits are reverted;
the simple `=== undefined` / truthiness checks are restored unchanged.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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