ccmux v0.4.0

Claude session status from structured sources (statusLine JSON + hooks), not pane-scraping

feat: Claude session status from structured sources (statusLine JSON + hooks), not pane-scraping

• Context %, model and cost now come from the STRUCTURED JSON Claude Code feeds its statusLine command
  (context_window.used_percentage × context_window_size), captured by an injected statusLine
  wrapper that ALSO runs the user's own statusline unchanged (or renders a minimal model · ctx%
  default if they have none). This removes the regex-over-rendered-text scrape and its dependency on
  the user's statusline FORMAT, so context % now works on default Claude Code and any user's setup —
  not only a bespoke statusline — with no hardcoded model→window map (the window size comes from Claude).
• Turn-boundary hooks (UserPromptSubmit/Stop/SessionStart) write a per-session working/idle lifecycle
  file. Working/idle display stays pane-decisive (the spinner is reliable and, unlike the hooks, reads
  idle correctly right after an ESC-interrupt); the hook fills only the cold-start gap and SessionStart
  clears a stale working. The lifecycle file is the substrate for future event-driven push/"waiting".
• Both inject via --settings and coexist with the chat Stop hook; status files live under
  ~/.ccmux/status/ and are cleared on stop/rm/restart. Fully fail-open — a status/statusline hiccup
  can never wedge a turn or corrupt the rendered bar.