* Add Codex CLI hooks integration
Adds `cmux codex install-hooks` to install lifecycle hooks into
~/.codex/hooks.json and enable the codex_hooks feature flag. The hooks
call `cmux codex-hook <event>` which gracefully no-ops (exit 0, prints
{}) when not running inside cmux, so they're safe to leave installed
globally.
Supported events: SessionStart (session tracking), UserPromptSubmit
(set Running status), Stop (completion notification + Idle status).
Install merges with existing user hooks and is idempotent. Uninstall
(`cmux codex uninstall-hooks`) removes only cmux-owned hooks,
identified by the `cmux codex-hook` command prefix.
* Show diff and ask for confirmation before modifying user config
install-hooks and uninstall-hooks now preview changes to hooks.json and
config.toml before applying, with a [Y/n] prompt. Pass --yes/-y to
skip confirmation.
Hook commands use `command -v cmux` guard so they silently no-op
(echo '{}') when cmux CLI is not on PATH (e.g. user runs codex in a
non-cmux terminal or after uninstalling cmux).
* Improve diff output with line numbers and context
install-hooks and uninstall-hooks now show unified-diff-style output
with line numbers and surrounding context lines, making it easier to
see exactly what will change in hooks.json and config.toml.
* Check CMUX_SURFACE_ID in shell guard before calling cmux
The hook shell command now checks [ -n "$CMUX_SURFACE_ID" ] first,
so it short-circuits to echo '{}' without ever invoking cmux when
not inside a cmux terminal. Prevents usage text and socket errors
from leaking into Codex hook output.
* Uninstall reverts config.toml; fix [features] section handling
uninstall-hooks now also removes codex_hooks from config.toml and
shows the diff for both files before asking for confirmation.
buildConfigWithCodexHooks uses exact TOML key matching instead of
substring contains, and inserts after the first [features] header
only (not replacingOccurrences which hit all matches).
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Co-authored-by: Lawrence Chen <lawrencecchen@users.noreply.github.com>
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