test(agentplugins): restore applied package before OpenCode collision repair

[777genius]

Summary

• Hosted OpenCode native lifecycle still failed after test(agentplugins): expect OpenCode native collision to refuse before commit #322: update correctly refused the foreign api/server key before commit (apply_failed / unmanaged identity).
• Repair then hit preflight_failed: repair must use the exact applied package revision because the fixture source had been rewritten to 3.0.0 and that revision was never applied.
• Restore the managed package tree into the fixture before repair so the collision is observed on host identity, not a revision mismatch. Config and skill unchanged proofs stay.

Test plan

• Isolated usecase install/repair: OpenCode, Windsurf, Claude, Cline
• TestAgentpluginsNativeInstaller
• CLI agentplugins tests
• Native Client Runtime opencode runtime on darwin-arm64 and windows-amd64 after this lands on architecture
• Do not merge refactor: installer core clean architecture refactor #288 to main

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