btc: reconstructor slice 3/7 — template_capture FIFO GBT-tx store (btc::coin::TemplateCapture) - #837
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…onstructor slice 3/7) Add btc::coin::TemplateCapture: a bounded FIFO store keyed by share_hash that retains each handed-out GBT transactions[] so the won-block reconstructor replays the EXACT non-coinbase set the share committed to, not a live-mempool re-selection (merkle-consistent only on a static mempool -> daemon-rejected block -> lost reward in prod). Miss replays an empty array -> valid coinbase-only block, never fail-closed. Body-identical to src/impl/dgb/coin/template_capture.hpp (namespace + log tag swap only). Leaf slice: opaque to transactions[] content, so pinned WITHOUT the slice-5 make_template_other_txs_fn bridge. New template_capture_test.cpp (5 KATs) rides the allowlisted btc_share_test. Local btc_share_test 80/80. btc-tree-only.
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Reconstructor slice 3/7, stacked on #835 (btc/gentx-coinbase-ssot).
Adds btc::coin::TemplateCapture — a FIFO store of the GBT transactions used to build a template, so a share can be faithfully reconstructed back into a full block. Coin-agnostic behavior mirrors the DGB reconstructor arc.
Merge behind #835.