fix(doctor): isolate registry diff conflicts

[ScriptedAlchemy]

Summary

• preflight each eligible reconstruction plan independently in doctor/health diffing
• preserve conflict issues without hiding missing rows from unrelated manifests
• cover a conflicting plan alongside a reconstructable missing plan

Verification

• cargo test orphan_reporting_uses_complete_registry_rows_not_token_accounting --lib
• cargo clippy --workspace --all-targets --locked -- -D warnings
• cargo fmt --check

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[chatgpt-codex-connector]

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