chore: set parallel agent dispatch and tracer ownership

docs/dispatch/agent-a-registry-api.md

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+# Agent A Dispatch: Registry/API
+
+## Branch + Worktree
+- Branch: `feat/registry-api`
+- Worktree: `C:\Users\Zenchant\codex\beadboard\.worktrees\agent-a`
+
+## Beads
+- `bb-6aj.1` (in_progress, assignee `agent-a`)
+- `bb-6aj.2` (open, assignee `agent-a`) after `bb-6aj.1` closes
+
+## Scope
+- Implement registry persistence at `%USERPROFILE%\.beadboard\projects.json`
+- Implement projects API route for add/remove/list
+- Windows-safe normalization only
+
+## File Ownership
+- `src/lib/registry.ts`
+- `src/app/api/projects/route.ts`
+- `tests/lib/registry.test.ts`
+- `tests/api/projects-route.test.ts`
+
+## Hard Constraints
+- Never write directly to `.beads/issues.jsonl`
+- No Unix-only assumptions
+- Validate and normalize project paths consistently
+
+## Verification
+```powershell
+npm run typecheck
+npm run test
+```
+