read_file and read_lesson URL-decode, posix-normalise, reject .. and absolute
paths, resolve through CourseRepository.resolvePath (symlinks followed), then
guard the real course-relative path and compare real paths with every
manifest browser.solution. Hidden files are refused too.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Retrieval now reads <dataDir>/cache/decks/<courseId>/<deckId>/text.json and
<dataDir>/cache/transcripts/<courseId>/<lessonId>.json (skipped when the lesson
has a transcript file). DraftSink returns { location?, branch?, commit? }, so
the studio's createDraftWriter(ctx) needs no adapter; generateDraft computes
paths itself and reports the draft branch.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
