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SPARQL query service (#754)

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SPARQL 1.1 query service wrapping pub/sub triples interface

Add a backend-agnostic SPARQL query service that parses SPARQL
queries using rdflib, decomposes them into triple pattern lookups
via the existing TriplesClient pub/sub interface, and performs
in-memory joins, filters, and projections.

Includes:
- SPARQL parser, algebra evaluator, expression evaluator, solution
  sequence operations (BGP, JOIN, OPTIONAL, UNION, FILTER, BIND,
  VALUES, GROUP BY, ORDER BY, LIMIT/OFFSET, DISTINCT, aggregates)
- FlowProcessor service with TriplesClientSpec
- Gateway dispatcher, request/response translators, API spec
- Python SDK method (FlowInstance.sparql_query)
- CLI command (tg-invoke-sparql-query)
- Tech spec (docs/tech-specs/sparql-query.md)

New unit tests for SPARQL query
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cybermaggedon 2026-04-02 17:21:39 +01:00 • committed by GitHub
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Makefile
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@ -77,8 +77,8 @@ some-containers:
-t ${CONTAINER_BASE}/trustgraph-base:${VERSION} .
${DOCKER} build -f containers/Containerfile.flow \
-t ${CONTAINER_BASE}/trustgraph-flow:${VERSION} .
${DOCKER} build -f containers/Containerfile.unstructured \
-t ${CONTAINER_BASE}/trustgraph-unstructured:${VERSION} .
# ${DOCKER} build -f containers/Containerfile.unstructured \
# -t ${CONTAINER_BASE}/trustgraph-unstructured:${VERSION} .
# ${DOCKER} build -f containers/Containerfile.vertexai \
# -t ${CONTAINER_BASE}/trustgraph-vertexai:${VERSION} .
# ${DOCKER} build -f containers/Containerfile.mcp \