Resolve Share Link Endpoint

GET /s/{share_id} for a share_type 'paper' link.

The live payload's shape (PublicLiveShareV1) with share_type: "paper", the share's artifacts_status and the paper block. It has no money field by construction: no dollar_values and no creator; the closed model refuses either.

Two blocks are the link's choice (FDR-7, amending S05 §3.12's "no positions, no strategy"): positions (symbol, side and weight only, computed on read from the paper ledger) exactly when disclosure.show_positions, and strategy (name, version, graph and fork URLs, never a component list) exactly when disclosure.include_strategy_source. show_dollar_values and show_creator_profile are always False.