[Wails] M5: Consumer drift warning (snapshot + banner)

[josh-padnick]

Summary

• Backs the Consumer drift warning piece of M5 from the plan: reviewers in consumer mode see a non-blocking banner when the gruntbook tree drifts from what they opened, protecting them from executing scripts that changed underneath them.
• Introduces core/watcher/ with OS-free Walk + Classify primitives so the snapshot/diff logic is testable with fake filesystems and portable into hosted mode later.
• WatcherService.StartWatch now takes a baseline snapshot (sha256-hashed, output-path-aware) and recursively registers every subdirectory with fsnotify. Debounced changes emit a classified watch:<watchID>:drift event alongside the existing :change.
• WatcherService.ResetSnapshot re-baselines after Reload so subsequent edits are measured against the just-reloaded state.
• Frontend: useWatchMode now returns { resetSnapshot } and accepts onDrift. New DriftBanner component (expand/collapse changed-file list, Reload, Dismiss). RunbookView renders it in consumer mode only; Author Mode continues to auto-reload and suppresses the banner.

Test plan

• go test ./core/watcher/... ./services/... ./core/... — passes (snapshot Walk skips .git/node_modules/output path, Classify is deterministically sorted, architecture test still blocks OS imports from core/).
• cd web && npx tsc -b — clean.
• cd web && npx vitest run — 229 tests pass.
• Manual: task desktop:dev, open a gruntbook, edit a script outside the app → banner appears; Reload re-baselines (banner stays gone for content-identical writes); Dismiss hides; next change re-opens with cumulative delta.
• Manual: toggle --watch (author mode) → auto-reload still fires and banner never renders.

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
runbooks	Ready	Preview, Comment	Apr 23, 2026 4:20pm

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