chore: set parallel agent dispatch and tracer ownership

docs/dispatch/agent-c-scanner.md

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+# Agent C Dispatch: Scanner
+
+## Branch + Worktree
+- Branch: `feat/scanner`
+- Worktree: `C:\Users\Zenchant\codex\beadboard\.worktrees\agent-c`
+
+## Beads
+- `bb-6aj.3` (open, assignee `agent-c`) start only after `bb-6aj.1` closure
+- `bb-6aj.3.1` optional follow-up
+
+## Scope
+- Scanner rooted to `%USERPROFILE%` by default
+- Bounded recursion and ignore patterns
+- Full-drive (`C:\`, `D:\`) scan must be explicit opt-in only
+
+## File Ownership
+- `src/lib/scanner.ts`
+- `src/app/api/scan/route.ts` (if needed)
+- `tests/lib/scanner.test.ts`
+
+## Hard Constraints
+- No default full-drive crawl
+- No Unix-only shell assumptions
+- Keep path normalization consistent
+
+## Verification
+```powershell
+npm run typecheck
+npm run test
+```
+