docs(dashsync): bump the platform pin to v4.1-dev tip b889e05a1e

[QuantumExplorer]

Summary

Updates DASHSYNC_MIGRATION.md's platform-pin record to today's verified pairing:

• App tip 1f195c6fb (post-fix(dashpay): write contact alias/note/hidden through setDashPayContactInfo #834) against origin/v4.1-dev tip b889e05a1e — dashpay arm64-sim build green, 2026-07-17.
• Picks up platform#4139 (partial-amount platform address withdrawal wrapper — the last app-required surface that previously lived only on a local sidecar branch) and platform#4140 (removal of EstablishedContact's clone-mutating setters).
• Records the new compatibility floor: platform tips ≥ #4140 require app tips ≥ #834 (contact meta writes through setDashPayContactInfo).
• Retires the v4.1-dev-local sidecar branch note — everything is upstream now; teammates should build against plain v4.1-dev plus the usual xcframework rebuild.

Doc-only.

🤖 Generated with Claude Code

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