…der (#271)

The won-block reconstructor frames the broadcast block as [gentx] ++ other_txs,
where other_txs is the captured-GBT template the won share was mined against. The
into that seam but defers the provider itself to the run-loop. main_dgb installs an
interim mempool RE-SELECTION lambda, merkle-consistent ONLY while the mempool is
static across the won window (regtest); in prod any mempool mutation between job
hand-out and won-block diverges the set -> wrong merkle root -> daemon-rejected
block -> lost reward.

coin/template_capture.hpp removes that race: TemplateCapture retains each handed-out
template transactions[] keyed by the resulting share_hash and replays it verbatim at
won-block. provider() yields the captured_template_txs_fn make_template_other_txs_fn
consumes. Miss -> empty array -> a VALID coinbase-only block (the reconstructor empty
contract), NOT fail-closed: a missing template must not forfeit the subsidy. Bounded
FIFO so memory is O(capacity), not O(jobs). Thread-safe (capture on the job/mint path,
provide on the COMPUTE thread inside the closure).

dgb_template_capture_test (5/5): capture->provide json round-trip; miss replays empty;
composed through the #299 bridge a HIT decodes byte-faithfully to the MutableTransaction
vector deserialize_template_other_txs yields directly and a MISS to empty; overwrite-
same-hash keeps one entry; FIFO eviction drops the oldest. Stacks on #299. Fenced to
src/impl/dgb/; no p2pool-merged-v36 surface. Both build.yml allowlists updated (#143).

dgb: template-txs producer bridge (tx-inclusion slice — decode GBT transactions[] into won-block other_txs)

…der (#271)

The won-block reconstructor frames the broadcast block as [gentx] ++ other_txs,
where other_txs is the captured-GBT template the won share was mined against. The
into that seam but defers the provider itself to the run-loop. main_dgb installs an
interim mempool RE-SELECTION lambda, merkle-consistent ONLY while the mempool is
static across the won window (regtest); in prod any mempool mutation between job
hand-out and won-block diverges the set -> wrong merkle root -> daemon-rejected
block -> lost reward.

coin/template_capture.hpp removes that race: TemplateCapture retains each handed-out
template transactions[] keyed by the resulting share_hash and replays it verbatim at
won-block. provider() yields the captured_template_txs_fn make_template_other_txs_fn
consumes. Miss -> empty array -> a VALID coinbase-only block (the reconstructor empty
contract), NOT fail-closed: a missing template must not forfeit the subsidy. Bounded
FIFO so memory is O(capacity), not O(jobs). Thread-safe (capture on the job/mint path,
provide on the COMPUTE thread inside the closure).

dgb_template_capture_test (5/5): capture->provide json round-trip; miss replays empty;
composed through the #299 bridge a HIT decodes byte-faithfully to the MutableTransaction
vector deserialize_template_other_txs yields directly and a MISS to empty; overwrite-
same-hash keeps one entry; FIFO eviction drops the oldest. Stacks on #299. Fenced to
src/impl/dgb/; no p2pool-merged-v36 surface. Both build.yml allowlists updated (#143).

Replace the interim coinbase-only template_other_txs_fn stub in the #82
forced-won live seam with the production capture->bridge path:

- declare a run-loop-scoped dgb::coin::TemplateCapture (#300/#271) that
  outlives every tracker callback the provider() is installed into
- feed it through make_template_other_txs_fn (#299) as the reconstruct
  closure template_other_txs_fn, so a won block replays the EXACT
  non-coinbase set the share committed to (merkle-consistent) instead of
  reconstructing coinbase-only
- seed_forced_from_gbt captures the node-B GBT transactions[] keyed by the
  forced share hash; coinbasevalue already includes those fees so the
  regenerated gentx subsidy stays balanced

A capture MISS still decodes to an empty set -> a valid coinbase-only
block (never fail-closed). Per-coin: src/impl/dgb + main_dgb only.