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/log.md

@@ -13,3 +13,4 @@ Parseable: `grep "^## \[" .wiki/log.md | tail -20`.
 ---
 
 ## [2026-05-22] init | wiki bootstrapped via setup-wiki@1.0.0
+## [2026-05-22] ingest | promoted .workshop/.brainstorm/board-viewer.md → concepts/board-viewer.md