Local `pnpm test:isolated` was failing because a concurrently-running
fusion app continually mutates `~/.fusion` (databases, agent sessions,
memory, automations, plugins, logs). Filter those runtime-owned paths
from the protected-dir signature, widen the baseline-stability sampling
window, and re-sample on suspected violations so transient app activity
doesn't masquerade as test pollution.
Tests still cannot legitimately write into these paths — they're skipped
because the *running app* is expected to.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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