## Why
The TUI still reached through `codex-app-server-client::legacy_core` for
process telemetry setup and personality migration, exposing core-only
details after the TUI moved onto the app-server layer.
This is part of our ongoing efforts to whittle away at the legacy_core
shim that was left over after migrating the TUI to the app server.
This change is just a refactor/rename and should be behavior-neutral and
low risk.
## What changed
- expose OTEL provider construction through the app-server client and
keep the small process/SQLite telemetry adapters local to the TUI
- collapse personality migration results to the config-reload decision
the TUI needs
- remove the `legacy_core::otel_init` and
`legacy_core::personality_migration` subnamespaces
Eric Traut
ab4ce40042