Fold Forum (G/H/I/W cards) and Technote (E/W cards) artifacts into forum_post/technote tables; forum.list/get and technote.list/get ops; threaded forum pages and technote pages through the sanitizer-gated markup pipeline; both kinds join the unified timeline (y=e|f) and nav. The parser already handled these types, so this is fold+render only. Verified against libfossil's real history: 35 forum threads, 26 technotes render, graph lint clean. check-in: c212383053 user: dmestas tags: trunk