promote: workshop/board-viewer brainstorm → concepts + 5 tasks

- concepts/board-viewer.md (design, promoted from .workshop)
- .tasks/STATUS.md + 5 per-task files:
  - board-viewer-pointers (pre-impl, status=ready)
  - board-viewer-gitea-reader (impl, TDD, status=ready)
  - board-viewer-html-render (impl, TDD, blocker=gitea-reader)
  - board-viewer-cron-deploy (impl, infra carve-out, blocker=html-render)
  - board-viewer-review (umbrella, status=blocked)

TDD-mode embedded in impl-tasks per follow tdd-criteria trigger in CLAUDE.md.
MCP write-side workaround per memory reference_projects_meta_resolveTarget_bug.md.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.wiki/index.md

@@ -12,7 +12,8 @@ Catalog of all wiki pages. One line per page, organized by type. Updated on ever
 
 ## Concepts
 
-<!-- (none yet) -->
+- [board-viewer.md](concepts/board-viewer.md) — design: read-only HTML kanban-viewer over Gitea API
+- [bootstrap-manifest.md](concepts/bootstrap-manifest.md) — skill versions used to bootstrap layout
 
 ## Packages