#332 fix(install): clean up legacy bundle agents + migrate .env on DMG upgrade

[Anonymous]

Originally created by: Akarsh-Hegde

Summary

• Adds cleanup_legacy_mlx_server() — stops the old bundle's com.meridiona.mlx-server launchd agent before the tray's in-process MlxManager starts, preventing EADDRINUSE port-contention on :7823.
• Adds cleanup_legacy_ui() — removes the retired com.meridiona.ui Node-server agent (zombie process burning ~150 MB).
• Adds migrate_legacy_bundle_env() — copies ~/.meridian/app/.env → ~/.meridian/.env when the canonical file is absent, so Jira/GitHub/Linear tokens survive the DMG upgrade without forcing wizard re-entry.

All three follow the existing cleanup_legacy_screenpipe idiom. Covered by a new unit test exercising all three branches of the env-migration logic.

Why now

Targets users migrating from the old npm/curl bundle to the self-contained DMG (v1.64.0). Without this fix they hit silent port contention + lost credentials on first launch after the upgrade. Needs to land in pre-main so it's included in the [#330] fold.

Test plan

• [ ] cargo test -p meridian-tray — unit test backend_install::tests::migrate_legacy_bundle_env_* passes
• [ ] Manual: install old bundle, then install new DMG — verify no EADDRINUSE in logs, ~/.meridian/.env has the migrated creds, and neither com.meridiona.mlx-server nor com.meridiona.ui are registered post-install

🤖 Generated with Claude Code

https://claude.ai/code/session_01SKdh3tKWLZhtQ9FCfA5RYH

[Anonymous]

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[Anonymous]

Ticket changed by: Akarsh-Hegde

• status: open --> closed