chore: set parallel agent dispatch and tracer ownership

docs/dispatch/agent-b-kanban.md

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+# Agent B Dispatch: Tracer Bullet 1 Kanban
+
+## Branch + Worktree
+- Branch: `feat/kanban-baseline`
+- Worktree: `C:\Users\Zenchant\codex\beadboard\.worktrees\agent-b`
+
+## Beads
+- `bb-trz.1` (in_progress, assignee `agent-b`)
+- `bb-trz.2` (in_progress, assignee `agent-b`)
+- `bb-trz.3` (in_progress, assignee `agent-b`)
+- `bb-trz.4` (in_progress, assignee `agent-b`)
+
+## Scope
+- Deliver tracer bullet 1 baseline:
+  - status columns (`open`, `in_progress`, `blocked`, `deferred`, `closed`)
+  - bead cards (priority/type/labels/assignee/dependency count)
+  - detail panel
+  - search/filter/stats controls
+- Use real read path (`.beads/issues.jsonl`) from server layer, not demo-only data
+
+## File Ownership
+- `src/app/page.tsx`
+- `src/components/kanban/*`
+- `src/components/shared/*`
+- `src/lib/kanban.ts`
+- `src/lib/read-issues.ts`
+- `tests/lib/kanban.test.ts`
+
+## Hard Constraints
+- Read boundary only for this phase
+- No write path to JSONL
+- Keep Windows-safe path handling in read layer
+
+## Verification
+```powershell
+npm run typecheck
+npm run test
+npm run dev
+```
+