- Band-invariant test now sweeps high altitude (6 km) as well as sea level, so the lapse term + cold-end clamp are exercised jointly, not lat alone. (Hoshe #1, Tyre #3) - Clarify the temp() helper comment: seed 0 is deterministic but still applies a constant non-zero nudge. (Hoshe #2) - (Hoshe #3: confirmed tectonic_activity is genuinely absent from systems-schema.sql; the reader's 'not in schema' comment is accurate — no change.) Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>