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Eric Traut 0445b290fe [1 of 4] tui: route primary settings writes through app server (#22913)
## Why
The TUI can run against a remote app server, but several high-traffic
settings still persisted by editing the local config file. That sends
remote sessions' preference writes to the wrong machine and lets local
disk state drift from the app-server-owned config.

This is **[1 of 4]** in a stacked series that moves TUI-owned config
mutations onto app-server APIs.

## What changed
- Added a small TUI helper for typed app-server config writes.
- Routed primary interactive preference writes through
`config/batchWrite`.
- Preserved existing profile scoping for settings that already support
`profiles.<profile>.*` overrides.

## Config keys affected
- `model`
- `model_reasoning_effort`
- `personality`
- `service_tier`
- `plan_mode_reasoning_effort`
- `approvals_reviewer`
- `notice.fast_default_opt_out`
- Profile-scoped equivalents under `profiles.<profile>.*`

## Suggested manual validation
- Connect the TUI to a remote app server, change `model` and
`model_reasoning_effort`, reconnect, and confirm the remote config
retained both values while the local `config.toml` did not change.
- Change `personality`, `plan_mode_reasoning_effort`, and the explicit
auto-review selection, then reconnect and confirm those choices persist
through the app server.
- Clear the service tier back to default and confirm `service_tier` is
cleared while `notice.fast_default_opt_out = true` is persisted
remotely.
- Repeat one setting change with an active profile and confirm the write
lands under `profiles.<profile>.*`.

## Stack
1. [#22913](https://github.com/openai/codex/pull/22913) `[1 of 4]`
primary settings writes
2. [#22914](https://github.com/openai/codex/pull/22914) `[2 of 4]` app
and skill enablement
3. [#22915](https://github.com/openai/codex/pull/22915) `[3 of 4]`
feature and memory toggles
4. [#22916](https://github.com/openai/codex/pull/22916) `[4 of 4]`
startup and onboarding bookkeeping
2026-05-16 14:27:02 -07:00
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