Remove peer fetch/acquire/merge support for CE/export sidecar SHAMaps and keep them as local same-process snapshots only.
Harden generic transaction-set paths so sidecar maps are not advertised, served, acquired, or wrapped as RCLTxSet, and delete the stale fetch-positive .testnet suite.
Make entropy failure terminal at selection time and mirror that invariant in the CSF harness; keep Export witness materialization rooted in accepted exportSigSetHash rather than local timeout state.
Compile out sidecar acquisition and merge plumbing unless xahaud_sidecar_reconciliation is enabled, and move fetch-positive .testnet scenarios into an opt-in suite.
When reconciliation is enabled, gate eager fetches on current trusted root support so first-seen transient roots do not trigger network acquisition. This keeps the recovery path available for measurement without making it the default path.
Verified default OFF with x-format-changed, git diff --check, x-quick-check, cmake configure/build, and ./build/rippled --unittest=ConsensusExtensions. ON path syntax-checked; Claude is assigned the parallel ON build/test review in a separate worktree.
Materialize ttEXPORT_SIGNATURES from the accepted export sidecar root during live consensus builds, then let apply trust that tx-stream witness membership while still verifying each signature and enforcing quorum.
Direct apply paths remain conservative, and historical replay uses the same witness-membership rule after manifests may have rotated. Update the intent docs and tests for live, direct, and replay modes.
Thread the replay parent through ApplyOptions so export replay can rebuild the historical validator view without relying on LedgerMaster visibility for freshly replayed parents.
Harden ttEXPORT_SIGNATURES canonicality before witness indexing, validate witness signer accounts against their pubkeys, reject ambiguous absent NetworkID on low-ID source chains, and lock the consensus phase accessor.
Add focused regression coverage and clarify that destination SignerList/quorum compatibility is an operator/client contract.
Historical LedgerReplay now treats ttEXPORT_SIGNATURES witnesses as validated-history membership input, while still verifying signatures and threshold. Live build and validation keep the current manifest-backed active-signer check.
Harden witness handling by indexing only canonical same-ledger pseudos, dropping duplicate witnesses as ambiguous, and replacing pre-existing mismatched witnesses with the accepted sidecar witness during onPreBuild.
Document the lean witness-vs-XPOP proof distinction and cover the manifest-rotation replay case with an Export regression test.
A second pending export for the same shadow-ticket key is a ledger-object conflict, not an internal failure. Return tecDUPLICATE and cover the live-latch case in Export_test.
Require entropy injection and export apply to consume only sidecar roots accepted by their convergence gates. Local timeout state and later collector growth no longer participate in closed-ledger material once a sidecar root is accepted.
Also guard RCLConsensus::extensionsBusy() under the consensus mutex, cap exported multisig signer arrays to the protocol maximum after canonical signer sorting, and document the remaining accept-vs-timeout liveness tradeoff.
Add regressions for unaccepted export sidecar roots, late export collector mutation, entropy accepted-root handling, exported signer caps, and CSF accepted-sidecar behavior.
