fix(harness): migrate legacy Cursor install-state to profile schema v2

[solomonneas]

Summary

• Profile sync upgrades legacy Cursor install-state.json (version: 1) to schema v2 instead of deadlocking on unsupported ownership state version: None.
• Migration preserves ownership attestations from legacy files / hooks / mcp keys so profile uninstall still removes managed surfaces.
• Legacy harness install cursor on an existing v2 state now reports explicit sync/uninstall recovery commands.

Fixes #468

Test plan

• ./scripts/verify
• pytest tests/test_cursor_install_state_migration.py
• Manual repro: legacy install → profile sync → profile uninstall

Made with Cursor

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