Domain services (SubtitleIdentifier, PatternDetector) used to import the
concrete SubtitleKnowledgeBase class directly from infrastructure for
their type hint. With this commit they depend on a structural Protocol
in alfred/domain/subtitles/ports/knowledge.py declaring just the 7
read-only query methods the domain actually consumes.
The concrete YAML-backed SubtitleKnowledgeBase in infrastructure remains
the sole adapter — no rename, no shim. With this change
alfred/domain/subtitles/ has zero imports from alfred/infrastructure/.
Also extend the changelog entry covering the full domain-io-extraction
branch.
francwa
df798f55cc