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Pull #142

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feat: add select-variable-reuse test and allow AS-bound variable references

Add support for referencing variables bound by preceding (expr AS ?var)
expressions in subsequent SELECT expressions, per the updated SPARQL spec
(w3c/sparql-query#380, w3c/rdf-tests#340).

The query `SELECT (COUNT(?v) AS ?count) (?count + 1 AS ?countPlusOne) ...`
was previously rejected with 'Use of ungrouped variable' because the
validator did not recognize that ?count was in scope from an earlier
AS binding.

Changes:
- Fix queryProjectionIsGood validation to track AS-bound variables and
  allow their use in subsequent projection expressions
- Add select-variable-reuse test with AST, algebra, and generator statics

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

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