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Keep literal direction when objectifying SPARQL 1.2 algebra

algebraUtils.objectify existed twice: once in algebra-transformations-1-1
and once, with support for the direction of directional language-tagged
strings, in algebra-transformations-1-2. The SPARQL 1.2 fixture generator
imported the 1.1 variant, so regenerating the sparql12 fixtures silently
dropped "direction" ("hello"@en--ltr became "hello"@en).

Keep a single objectify in 1.1 that also copies direction and returns
null and undefined as-is instead of crashing on them. The 1.2 algebraUtils
reuses it. The 1.2 generator now uses the 1.2 utilities and writes a
trailing newline like the 1.1 one. Both generators now build the canonical
SPARQL from the algebra itself, as the canonical SPARQL tests do. Before,
they built it from the JSON form, which gave a different result for
sparql-1-2-syntax-expr-tripleterm-06-quads. Regenerating all fixtures now
gives no diff, apart from dropping the trailing newline on six hand-edited
canonical files.

Add a sparql12 fixture with directional literals in VALUES, triple terms,
a reified triple, FILTER expressions and function arguments, plus unit
tests for objectify in both packages.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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