feat: response-viewer support for Codex sessions

The response-viewer (eye) currently reads only ~/.claude/projects — for
Codex panes it falls back to a raw terminal-buffer dump. This adds a
Codex-aware reader with exact per-pane rollout attribution.

Locating THIS pane's rollout (~/.codex/sessions/**), in confidence order:

1. history match — Session tracks the pane's last Enter
   (codexLastSubmitAt); correlating it against ~/.codex/history.jsonl
   {session_id, ts} entries identifies the thread the pane is ACTUALLY
   on, surviving /resume, /new and /fork typed inside the codex TUI.
   An entry is credited to the pane whose Enter is closest, so menu
   keystrokes in other panes can't steal attribution.
2. originator match — codex panes are spawned with
   CODEX_INTERNAL_ORIGINATOR_OVERRIDE=codeman_<sessionId>, which codex
   (verified on 0.144.1) writes into session_meta.originator of every
   rollout it creates.
3. resume-id match — resumed rollouts keep their original session_meta
   (codex appends without rewriting), but the uuid is in the filename.
4. cwd+mtime heuristic — case-blind compare (codex records launch-time
   path case) and rollouts claimed by other panes are excluded.

Reader details: user turns come from event_msg/user_message (real input
only — AGENTS.md / environment_context injections never appear there),
deduped against legacy response_item rows per-text so mixed-version
rollouts keep full history; image inputs render an [image xN]
placeholder; session_meta identity is cached per path (write-once).

Frontend: thread role label follows session mode (Codex/Gemini/
OpenCode); the terminal-buffer fallback is Claude-only — TUI modes show
a clear placeholder instead of a repaint dump.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/tmux-manager.ts

@@ -932,6 +932,12 @@ export class TmuxManager extends EventEmitter implements TerminalMultiplexer {
       'export LC_ALL=en_US.UTF-8',
       mode === 'codex' || mode === 'gemini' ? 'export COLORTERM=truecolor' : 'unset COLORTERM',
       ...(mode === 'codex' || mode === 'gemini' ? ['unset NO_COLOR'] : []),
+      // Stamp each Codex pane with a unique originator so the response-viewer
+      // can locate THIS pane's rollout exactly — codex writes the value into
+      // session_meta.originator of every rollout it creates. Without it,
+      // rollouts are matched by cwd+mtime and two panes in the same directory
+      // bleed into each other.
+      ...(mode === 'codex' ? [`export CODEX_INTERNAL_ORIGINATOR_OVERRIDE=codeman_${sessionId}`] : []),
       'export CODEMAN_MUX=1',
       `export CODEMAN_SESSION_ID=${sessionId}`,
       `export CODEMAN_MUX_NAME=${muxName}`,