Add Cloud Sync device tokens

[bholmesdev]

Summary

• add hashed per-device token storage and auth checks for Cloud Sync functions
• add CLI token mint/list/revoke plus token-aware cloud connect/create/sync/watch
• require web app connection tokens and thread them through workspace/file/asset calls

Testing

• pnpm check
• pnpm --filter @hubble.md/sync build
• pnpm --filter @hubble.md/convex-client build
• pnpm typecheck
• pnpm build:desktop
• pnpm --filter @hubble.md/cli build
• node packages/cli/dist/index.js tokens --help

Closes #25

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Project	Deployment	Actions	Updated (UTC)
hubble-md-web	Ready	Preview, Comment	Jul 4, 2026 1:54pm

[bholmesdev]

Closing as stale while Cloud Sync is redesigned from first principles.