## Why
The configurable `/statusline` and terminal title can display session
token usage. That display was using the raw total token count, which
includes cached input tokens, so it significantly overstated the token
usage compared with the blended token count shown elsewhere (in
`/status` and tracked in goals). This inconsistency resulted in user
confusion. We don't want to report cached tokens because we don't charge
for them and they are somewhat of an implementation detail that users
shouldn't care about.
## What changed
- Use `TokenUsage::blended_total()` for the `used-tokens` status surface
item so cached input is excluded.
- Add a brief comment to `tokens_in_context_window()` clarifying that it
returns raw `total_tokens`, whose meaning depends on whether the caller
has last-turn or accumulated usage.
## Why
This stack moves `codex-tui` away from the core protocol event surface
and toward app-server API shapes plus TUI-owned local models. This first
PR sets up the lower-risk foundation: it introduces the local model
surface and extracts app-server event routing into focused TUI modules
while preserving the existing behavior for the larger migration in PR2.
This PR is part 1 of a 2-PR stack:
1. Add TUI-owned replacement models and extract app-server event
routing.
2. Move the active TUI flow to app-server notifications and delete
obsolete adapter code.
## What changed
- Added TUI-owned approval, diff, session state, session resume, token
usage, and user-message models.
- Added `app/app_server_event_targets.rs` and `app/app_server_events.rs`
to hold app-server event targeting and dispatch logic outside `app.rs`.
- Updated app/status tests to use the local model layer and added
focused routing coverage.
- Boxed a few large async TUI test futures so this base layer remains
checkable without overflowing the default test stack.
## Verification
- `cargo check -p codex-tui --tests`
Eric Traut ·