New tables (courses, course_modules, module_activities,
activity_completions) layered over the existing scenario/assessment/
achievement systems — a lab activity references an existing scenario_id,
an assessment/capstone activity references an existing
assessment_definition_id, neither duplicated. Long-form lesson prose
lives in git-tracked Markdown (content/root/), split into shared vs.
instructor-only sections by a '## Instructor Notes' heading convention
(content.js) rather than a second file or a CMS.
course-progress.js derives completion from EXISTING sources only:
auto_scenario reads the progress table, auto_assessment reads
achievements by assessment_definition_id, manual_marker is the one
genuinely new piece of state (for lesson-only activities with nothing
else to derive completion from). Prerequisite locking treats a
zero-content (PLANNED) prerequisite as vacuously satisfied, so an
honestly-unbuilt course never permanently locks everything after it.
Found by testing: computing a level's prerequisite lock and stripping
its working totals in the same map iteration made the result depend on
iteration order. Fixed with two explicit passes.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
