docs: add dependency consolidation ADR

[Finesssee]

Clean reconstruction of approved #423 delta on current main. Original PR #423 reviewed this change.

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• docs/adr/0006-dependency-consolidation-candidates.md

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[Finesssee]

Thermo-nuclear code quality review: APPROVE

No structural findings.

This is a documentation-only proposed ADR. It is explicit that dependencies are adopted only when the implementation PR deletes or centralizes real code, and its acceptance criteria favor smaller reversible migrations rather than dependency accumulation. No code-quality regression is introduced here.