GET/PUT /api/v1/admin/sensitive-keys (ADMIN only). PUT accepts optional
pushToAgents param — when true, fans out merged global+per-app sensitive
keys to all live agents via CONFIG_UPDATE SSE commands with 10-second
shared deadline. Per-app keys extracted via JsonNode to avoid depending
on ApplicationConfig.getSensitiveKeys() not yet in the published
cameleer3-common jar. Includes audit logging on every PUT.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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