The gateway was gating `reasoning.delta` and `reasoning.available`
behind `_reasoning_visible(sid)` (true iff `display.show_reasoning:
true` or `tool_progress_mode: verbose`). With the default config,
neither was true — so reasoning events never reached the TUI,
`turn.reasoning` stayed empty, `reasoningTokens` stayed 0, and the
Thinking expander showed no token label for the whole turn. Tools
still reported tokens because `tool.start` had no such gate.
Then `message.complete` fired with `payload.reasoning` populated, the
TUI saved it into `msg.thinking`, and the finalized row's expander
sprouted "~36 tokens" post-hoc. That's the "tokens appear after the
turn" jank.
Remove the gate on emission. The TUI is responsible for whether to
display reasoning content (detailsMode + collapsed expander already
handle that). Token counting becomes continuous throughout the turn,
matching how tools work.
Also dropped the now-unused `_reasoning_visible` and
`_session_show_reasoning` helpers. `show_reasoning` config key stays
in place — it's still toggled via `/reasoning show|hide` and read
elsewhere for potential future TUI-side gating.
40f2368875