Abandon a transaction only on proof, and keep watching failed rows (B-78, TX-15, TX-17, TX-23, TX-26, ELC-28, DAT-33, DAT-36, DAT-69, DAT-72, AUD-11, AUD-12, AUD-31, AUD-39, API-32)

reconcile_once abandoned a row when the *active* server's history lacked its txid:
after 120s for `building` (which a restart onto a different server makes likely),
after 6h for `pending`, and all at once after a forward clock jump. It re-checked the
status but not the txid, so it raced the bumper, and a `failed` row was never looked at
again.

- The reconciler asks every server (ElectrumListener.get_histories, active + others) for
  the history of the row's address and looks for every txid of the row. Present on any
  server -> promoted (adopting the version found). Absent is only "no server of the
  quorum knows it" and needs the active server plus the quorum minimum of the others to
  have answered; even then nothing is released without proof:
  (a) an input spent in a block by a transaction that is none of the row's versions,
      agreed by a strict majority of a quorum of the other servers (confirmed_spender), or
  (b) a rebroadcast of the latest raw tx to every server (rebroadcast_everywhere)
      refused by all of them, explicitly, for missing/spent inputs.
  Accepted or "already known" by any server means alive; a fee refusal is not proof
  (`building` -> `pending` for the bumper, `pending` untouched); too few answers or
  anything else leaves the row alone. failure_reason names the proof.
- The write re-reads status *and* current_txid under begin_immediate (TX-26).
- pending_transactions.failed_at (set by _abandon and _release_failed_withdrawal) starts
  a 14-day watch: a failed row that a majority of the other servers (at least the quorum
  minimum) list in a block becomes `confirmed`, writes pending_tx_resurrected once and
  pauses the lottery with paused_reason `resurrected_tx`; linked rows are not corrected.
  The confirmation is by quorum of histories for now; merkle proofs come with B-83.
- round_config.paused_reason (migration b7d2e41c9a05, with the failed_at one): `operator`
  from POST /admin/pause (which accepts an optional `note` and never overwrites an
  automatic reason), cleared by resume, which logs the reason it lifted; exposed on
  /admin/config and GET /rounds/current. rounds/pause.py:pause_automatically is the
  system's way in.
- PendingTransactionReconciler takes the listener as `network`; with none it can promote
  but never abandon.

Tests changed because the spec changed: the three reconciler tests that expect an
abandonment (and the one in test_tx_versions) now supply a network that proves the
transaction is gone.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tests/unit/test_tx_versions.py

@@ -37,7 +37,7 @@ from app.wallet.hd import derive_pool_address, derive_user_address, derive_user_
 from app.wallet.plm_network import PLM_MAINNET
 from app.wallet.psbt_builder import Utxo, build_signed_transaction
 from app.withdrawals.service import request_withdrawal
-from tests.unit.fake_network import FakeNetwork, rpc_error
+from tests.unit.fake_network import FakeNetwork, ScriptedNetwork, rpc_error
 from tests.unit.test_bets import _make_funded_user
 from tests.unit.test_bets import session_factory as bets_session_factory  # noqa: F401  (fixture)
 from tests.unit.test_broadcast import FakeClient as ChainClient, session_factory  # noqa: F401  (fixture)
@@ -441,7 +441,7 @@ async def test_abandoning_a_row_releases_inputs_claimed_by_any_of_its_versions(s
         await session.commit()
     client.history = []  # nobody knows any version
 
-    await reconcile_once(session_factory, client)
+    await reconcile_once(session_factory, client, ScriptedNetwork.proof_of_absence())
 
     async with session_factory() as session:
         assert (await session.get(PendingTransaction, seeded["pending_id"])).status == "failed"