Section 7.5: five runs recorded. The first idled nothing and never asked the gate; the second found the depth gap
(fixed 3301cf32); the third found the extension shortcut (fixed aa0182aa: a candidate on the sink's chain is not let
through, the depth along its own chain decides); the fourth, on aa0182aa, PASSES (B 2,750 bps at the fork, 183 DAA
deep, heavier by 183, A kept its chain for 150 s and learned 177 of B's blocks, 268 refusal lines, one per refused
block); the known-failed case PASSES (gate off, A reorged onto a 2,083 bps key's 162-DAA chain 25 s after the heal);
the harness's failed shape FAILS as it must. Three harness faults fixed on the way (shared ports, an RPC call before
the socket opened, a reorg test by key instead of by chain) and one build fault (ledger N5, the stub-engine node).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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