v0.2.1 — never-pause by default, tool_write catches silent failures

rimagent v0.2.1: never-pause by default, and a self-authored tool can't silently go dead

Small, fast follow-up to v0.2.0.

Fixed

• danger_think_speed defaulted to a full pause on every urgent step (hostiles, a downed colonist, a dialog, a critical alert). "No pause" was only a manual dashboard toggle held in memory, so it reset on every runner restart. It's now the shipped default: the game thinks at 1x instead of stopping; the dashboard can still force a pause per episode.
• tool_write could report a syntactically valid brain-authored tool as written successfully even when it registered zero callable tools (most commonly a missing @tool(...) decorator). That silent success is now an explicit failure message telling the model exactly what to check, so a self-authored tool can't quietly go dead without the model noticing.

Also

• The brain was reset to its seeded state for this release: every self-authored tool, watcher, and accumulated memory (notebook, journal, operator log, tracked-value history, scores) from pre-release testing is gone. The 20 seeded skills, rewritten for the Steward/director architecture in v0.2.0, remain.

Tests: mod 104, agent 151.