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## Why Experimental feature toggles and memory settings can update several related config values in one interaction. Keeping those writes local in a remote TUI session is especially dangerous because the UI can diverge from the app-server config while also leaving behind partially stale supporting keys. This is **[3 of 4]** in a stacked series that moves TUI-owned config mutations onto app-server APIs. ## What changed - Routed feature flag persistence through app-server batch writes, including the supporting reviewer and permission updates used by guardian approval. - Routed Windows sandbox mode persistence and legacy Windows feature cleanup through app-server writes. - Routed memory settings through app-server batch writes and updated the TUI tests to exercise the embedded app-server path. ## Config keys affected - `features.<feature_key>` - `profiles.<profile>.features.<feature_key>` - `approval_policy` - `sandbox_mode` - `approvals_reviewer` - `windows.sandbox` - `features.experimental_windows_sandbox` - `features.elevated_windows_sandbox` - `features.enable_experimental_windows_sandbox` - Profile-scoped Windows legacy feature variants under `profiles.<profile>.features.*` - `memories.use_memories` - `memories.generate_memories` - Profile-scoped memory variants under `profiles.<profile>.memories.*` ## Suggested manual validation - Connect the TUI to a remote app server, toggle guardian approval on and off, and confirm the remote config updates `features.guardian_approval`, reviewer state, approval policy, and sandbox mode coherently. - Toggle a default-false experimental feature at the root level, disable it again, and confirm the key clears instead of lingering as an unnecessary explicit `false`. - Change memory settings and confirm the remote config updates both memory keys while the running TUI reflects the new state. - On Windows, switch sandbox mode through the TUI and confirm `windows.sandbox` is updated while the legacy Windows feature keys are cleared. ## 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