scratch: untrack stray files so .gitignore actually applies
scratch/.gitignore declares "ignore everything except .gitignore itself"
but seven files were committed before that rule took effect, so git kept
tracking them despite the ignore directive. Drop them from the index
(--cached) so the directory is now genuinely local-only as intended.
Two of these files leaked notable content:
- scratch/entity-observer-prototype/run_experiment.py loaded a Gemini
API key from a hardcoded relative path into sol pbc's internal vault
(extro/cso/vault/api-keys/google-ai-studio.json). That path won't
resolve outside the founder's checkout anyway.
- scratch/entity-observer-prototype/results/tier2-flash-minimal-jsonl-nothink.json
contained a real entity-extraction sample with internal stakeholder
names and architecture notes.
Local copies are preserved on the founder's machine.