[NEXT][CLEANUP] Audit legacy dependencies and runtime usage

[remiceres]

Parent:
#543

Depends on:
#544

Goal

Assign every legacy reference in next.query to a known runtime role and a cleanup issue.

Scope

• Trace the real NextSparqlPipelineExecutor path for the supported corpus.
• Classify each reference as runtime, compatibility-only, test-only, public API risk, or unused.
• Audit expression adapters, direct next.data.impl.adapter consumers, copied KGRAM contracts, fully qualified references, wildcard imports, and static imports.
• Check repository-wide consumers before declaring a public class unused.
• Record the target cleanup issue for every retained reference.

Deliverable

A dependency map containing the source file, legacy type, runtime status, consumer, and target cleanup issue.

Acceptance criteria

• Every legacy reference has evidence and an owner.
• Unused-code candidates are listed separately.
• No deletion is included in this issue.

Estimate: 3–5 development days.