Box private runtime-selection diagnostic errors

[MrScripty]

After workflow-service clears the aggregate Clippy stage, runtime-registry reports five private Result paths returning a 224-byte diagnostic. Box only those private errors and unwrap at the automatic selection vector and resource-budget context adapters. Public API/DTO/JSON, ranking and accounting behavior remain unchanged; only failure paths add allocations.

Tests cover exact valid candidate count boundaries, the 64-bit count-overflow diagnostic JSON, and the full contextualized public resource-overflow payload. CI runs the complete registry crate with its existing successful selection and budget/underflow tests. Root source review accepted frozen e88e208b. Local changed-syntax/whitespace checks passed; hosted tests and aggregate qualification are pending.

Stacked on #39. A separate formatter-only correction is still needed for inherited recent constructor wrapping, alongside sibling frontend audit/a11y fixes in the final integration. Every aggregate gate and the final main-relative external review remain required before merge.

[coderabbitai]

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