comunica / traqula / 25555482151

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perf: cache IndirBuilder.build() result and use manual stack indexing in TransformerObject

- Cache DynamicIndirect instance in IndirBuilder.build(), invalidating
  on any rule mutation (patchRule, addRule, deleteRule, addMany,
  deleteMany, merge). Eliminates ~30 closure allocations per
  toAlgebra() call.
- Replace .at(-1)/.push()/.pop() with manual top-index tracking in
  transformObject/visitObject inner loops, avoiding function call
  overhead and array length mutations in tight traversal loops.

Benchmarks show:
- toAlgebra 1.1: 3.11x → 4.61x vs sparqlAlgebra (+48% ratio)
- visit all: 8,129 → 11,180 hz (+38% absolute)
- mapOperation: 4,557 → 5,160 hz (+13% absolute)

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

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