tui: tok/s excludes reported reasoning tokens in V2

Description

OpenCode V2's tok/s indicator excludes reported reasoning tokens from the numerator. This understates total generated-token throughput for reasoning-heavy responses.

The footer sums assistant.tokens.output, which is populated from Usage.visibleOutputTokens. That value is the provider's inclusive output count minus its reported reasoning count; reasoning is stored separately in assistant.tokens.reasoning.

The indicator should count both non-reasoning output and reasoning tokens, using a duration that covers the generation of both. For providers such as OpenAI, the raw API output count already includes reasoning, so the calculation must use OpenCode's normalized counters without double-counting the provider total.

Plugins

No plugins are required for the code-level reproduction below.

OpenCode version

V2, upstream source at 2df00955cb933e977427535d2505e50cbc689c69.

Steps to reproduce

1. Construct a completed assistant message with tokens.output = 20, tokens.reasoning = 80, and a 10-second interval between time.created and time.streamed.
2. Pass it to turnTokensPerSecond in packages/tui/src/routes/session/rows.ts, with no other assistant messages in the current prompt's history.
3. The calculation returns 2 tok/s: 20 / 10. Counting all 100 generated tokens over the same interval would give 10 tok/s.

This isolates the missing reasoning count from provider-specific timing behavior. In normal use, it affects the footer whenever a provider reports reasoning tokens separately and the tok/s indicator is enabled.

Screenshot and/or share link

Calculation:
https://github.com/anomalyco/opencode/blob/2df00955cb933e977427535d2505e50cbc689c69/packages/tui/src/routes/session/rows.ts#L349-L369

Session usage normalization:
https://github.com/anomalyco/opencode/blob/2df00955cb933e977427535d2505e50cbc689c69/packages/core/src/session/usage.ts#L11-L19

Operating System

macOS (Darwin 25.6.0, arm64); the calculation is platform-independent.

Terminal

iTerm2