3a of the researchowl-secrets centralization. Adds researchowl-secrets-infisical
synced from homelab/prod /researchowl (5 lowercase-hyphenated keys, passthrough).
Parallel name — old out-of-band researchowl-secrets stays live until 3c.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
