[gugu91]

Fixes #1095.

What changes

Placeholders no longer start a process each. They expand to plain option reads (#{@pi_window_state}, @pi_window_name, @pi_window_unread, @pi_window_count, @pi_window_summary, @pi_session_summary). One hidden job, #(#{@pi_query} env publish), is appended to status-right when any placeholder is in use. Each tick it:

1. reads every pane, window and session in one tmux call,
2. runs one ps liveness check,
3. writes only the changed aggregates in one chained set-option call. An unchanged tick writes nothing, so nothing redraws.

The job lives in status-right on purpose. tmux keys #() jobs by window inside the window list, but by client outside it.

• Placeholder names and behaviour are unchanged. Counts still render 0 in windows without Pi, so #{?#{pi_count},…} keeps working.
• Formats expanded by an older version of the plugin are rewritten to the new reads when the plugin loads again.
• Uninstall removes the job from status-right.
• The publisher still writes only pane data. The aggregates belong to the companion.
• status.ts SOCKET publish is new. The per-target query modes are unchanged.

Evidence

Measured on a live tmux server with an attached client and status-interval 1, counting job runs over 6 s with 4 windows:

Formats	Job runs in 6 s
Old (one job per placeholder per window)	29
New	6 (one per tick, flat as windows grow)

Before the fix, on my laptop with 10 windows, 3 placeholders and status-interval 5, the status bar used about 0.65 of a core and showed up to 15 Node processes at once.

Tests

• plugin.test.ts (updated, isolated tmux):
  • expanded window formats contain no #(
  • status-right gets exactly one publisher job, and reloading is idempotent
  • uninstall removes the job
  • legacy expansions are upgraded
  • counts render 0 before the first publish
  • the job prints nothing
  • each window and session gets its own aggregate
  • a released pane clears its window and session
• Running the session aggregate test caught a real bug while I wrote this: set-option -s targets the server, not the session.
• pnpm test in tmux/: 31 passed, plus the publisher node --test. tsc --noEmit, oxlint and lint:agent-standards are clean.