grenadeandClaude Opus 5
289a80a7eb
`discover_runtimes` seeded its map with two plain inserts — the runtime at block 1 and the runtime at the tip. On a chain that has only ever run one, both probes report the same `spec_version` and the second insert overwrote the first, so the recorded height was the tip rather than block 1. Mainnet therefore read "in force from #13,501", which is where this observer started watching and not where the runtime started. Heisenberg hid it: its two ends are different runtimes, so nothing was overwritten and all six boundaries came out right. Both call sites and the recursion now go through one `note` helper that keeps the lowest height seen. That is the invariant the whole search rests on — bisection meets a runtime inside its reign before it finds where the reign began, so a probe can only improve the bound and none may worsen it — and it was previously written out twice, correctly in the recursion and not at the seed. `lower_first_seen` takes the minimum, so the wrong row corrects itself on the next discovery pass rather than needing a migration. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Jp6a8EDar9ueEhAxzep4V5