feat(drive): watch exclude rule changes

[pocketsharkk]

WSPC Todo

• Ticket: Trigger full Drive sync when exclude rules change (tod_01KY997J59TQN9YRAQP6GSJCGZ)
• Source todo: Add Drive sync exclude rules (tod_01KY981JSZ4PQ234RX32ANKXRK)
• Spec: WSPC Add Drive sync exclude rules (tod_01KY981JSZ4PQ234RX32ANKXRK)

Summary

• let chokidar traverse .wspc-drive while forwarding only ignore add, change, and unlink events
• schedule ignore changes as sticky Full Reconciliations across debounce ordering and active syncs
• preserve suppression for other internal files and incremental behavior for ordinary local events

Test Plan

• npm test -- test/handwritten/drive/watch.test.ts
• npm run typecheck
• CHOKIDAR_USEPOLLING=1 env -u NO_COLOR TERM=xterm-256color npm test
• npm run build
• git diff --check