Add orchestrate skill: main-actor pattern + mav-agent/mav-tmux wrappers

One bot owns the chat and delegates coding to persistent tmux sub-agents,
using a .done file marker for a reliable handoff (status/wait/result).
Includes README + install.sh for one-command setup.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

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+# orchestrate-skill
+
+The **main-actor** pattern for bot teammates. One bot owns the chat and never
+blocks — it delegates real coding/build work to persistent `tmux` sub-agents,
+polls a done-marker, and reports results back.
+
+> One voice talks, hands stay clean.
+
+## What's inside
+
+```
+skill/SKILL.md   the skill itself (the playbook, conventions, anti-patterns)
+bin/mav-agent    spawn/observe named claude or codex sub-agents (one tmux window each)
+bin/mav-tmux     run a one-off command in the shared persistent tmux session
+install.sh       drop the skill + wrappers into your ~/.claude and ~/.local/bin
+```
+
+## Why
+
+If you do heavy work inline in your own turn, the chat freezes and the work dies
+when your session compacts or restarts. Instead: spawn the work in a tmux window
+that **outlives your turn**, and use a real file marker for the handoff so you
+always know when it's finished — no prompt-sniffing, no guessing.
+
+## The clean handoff
+
+Every `mav-agent run` writes, when the CLI exits:
+
+- `/tmp/mav-agent/<name>.out`  — full stdout/stderr
+- `/tmp/mav-agent/<name>.done` — exit code (present **only** when finished)
+
+`mav-agent status` / `wait` poll the marker. Present ⇒ done. That's the whole trick.
+
+## Install
+
+```bash
+git clone https://git.sevara.cloud/mav/orchestrate-skill.git
+cd orchestrate-skill && ./install.sh
+```
+
+Requires `tmux`, plus `claude` and/or `codex` on PATH. Then the `/orchestrate`
+skill shows up in your Claude Code session and the `mav-agent`/`mav-tmux` CLIs are
+on your PATH.
+
+## The loop
+
+1. Acknowledge in chat fast — never a silent turn.
+2. `mav-agent run <name> "<self-contained task with full context>"`
+3. `mav-agent wait <name> 60` (short) or end turn + `mav-agent status <name>` next wake.
+4. On done: `mav-agent result <name>`, summarize, reply. Check the exit code.
+5. `mav-agent kill <name>` once you've read it.
+
+See `skill/SKILL.md` for the full reference.