Gherkin spec for the routing guardrail: local produces the summary by default;
on local failure, fall back only to a user-configured BYO provider; with no BYO,
queue for retry and never send content to a third-party model. Encodes the
local-first/user-owned principle (VISION) as executable behavior.
Gherkin spec for the core use case: captioned video is summarized and delivered;
no-transcript video is recorded as skipped; unsubscribed channels are ignored;
already-summarized videos are not reprocessed. These scenarios seed the use-case
test suite (Clean Architecture core tested through fake adapters).
Per-user-isolated entities (no global cross-tenant video table per the S5/grill
correction), secrets stored by reference only (ESO/1Password, never the token),
brain delivery modelled as a sink_delivery row rather than brain-specific tables.
fallback_used recorded per summary as the Stage 0 quality signal. Future C dedup
and sharding explicitly out of scope.
Context and container diagrams, sequence diagrams for the core summarize-new-video
use case and the local-first/BYO AI routing fallback, and the Clean Architecture
layering. Ports & adapters keep the engine provider- and sink-agnostic, making
standalone-vs-homelab a wiring choice (ADR-003), not two codebases.
mathias