fix: bundle daemon sidecars in app build

[vforsh]

Summary

• bundle codex_monitor_daemon and codex_monitor_daemonctl via bundle.externalBin
• add scripts/build-tauri-sidecars.sh to build and stage sidecar binaries before Tauri bundling
• wire sidecar preparation into beforeBuildCommand
• document behavior in README and ignore generated src-tauri/binaries/

Notes

• this fixes app bundles missing the daemon binary required by codex_monitor_daemonctl

[vforsh]

@codex review

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Run sidecar build script with bash

The new build:tauri-sidecars script invokes sh scripts/build-tauri-sidecars.sh, but build-tauri-sidecars.sh is written for Bash (set -euo pipefail, arrays, [[ ... ]], BASH_SOURCE). On systems where /bin/sh is not Bash (e.g. Ubuntu dash), this command fails immediately (set: Illegal option -o pipefail), so the sidecar build entrypoint added in this commit is unusable and cannot prepare binaries when called directly.

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[vforsh]

Fixed in e27036e. I replaced the shell-only sidecar step with a cross-platform Node script (scripts/build-tauri-sidecars.mjs) and updated both build:tauri-sidecars and beforeBuildCommand to use it, so this no longer depends on Bash or ./...sh on Windows.