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NeilandOrca
5ea7df1a5b
fish arms `CSI ?2031h` before painting each prompt and withdraws it when it hands the tty to a child — a ~1ms window. Orca answered that subscribe with `CSI ?997;Nn` across a 1-3ms renderer hop, so the reply landed after the withdrawal and was read as stdin by the next child, corrupting `brew`/`npx` `[y/N]` prompts. The reply is not stale by Orca's own view when written (measured staleReplies: 0), so no suppress-the-stale-reply scheme can close this — the information needed to suppress does not exist yet. Nothing asked for the reply either. The Contour spec says a terminal "should only send out the DSR when the palette has been updated"; Ghostty (Termio.zig:729 — force=true reachable only from the ?996n DSR), iTerm2 (VT100Terminal.m:995 — flag only) and xterm.js (InputHandler.ts:2035 — flag only) all emit nothing on the DECSET. So stop entering the race: record the subscription, answer nothing. Of 17 real programs measured under a pty, only fish, tmux, claude and opencode subscribe; none block on a reply, and answering produces one redundant palette re-query and zero rendering difference. tmux is the only one that sends `?996n`, which Orca still answers. - Subscribes are record-only at all four emitters (live scan, hidden-gate fact, parked byte watcher, parked responder — the last is deleted, it only replied). - `?996n` answers, the subscription registry, and the theme-flip push are unchanged. `paneLastThemeMode` is still seeded at subscribe so the next appearance re-apply is not read as a flip. - Replay grammar carries `?2031l` alongside `?2031h`, so a late-attaching remote client no longer registers a subscription the TUI already retired. Also closes fish-integration gaps found alongside: `unset` (which fish lacks) becomes `set -e` on paths parsed by the client's login shell, `config.fish` is parsed for agent-home detection, and bracketed-paste startup delivery is made consistent across local/daemon/relay. Regression test drives real fish 4.7.1 under node-pty and asserts on what the child process reads; it fails against pre-fix code with the exact payload from the issue. CI installs fish 4 and fails loudly rather than skipping. Closes #9993 Co-authored-by: Orca <help@stably.ai>