add bin/archy-cockpit — persistent tmux cockpit for Archy sessions

[Ahmad-Ez]

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Summary

• Adds bin/archy-cockpit — a small bash launcher that opens (or reattaches to) a named tmux session for any Archy project
• 3-pane layout: conductor shell (left), live sessions.log tail (top-right), scratch shell (bottom-right)
• Idempotent: if the session already exists, reattaches instead of creating a new one
• Session named archy-<project-dirname> so multiple projects never collide
• Adds a short "Cockpit" entry to the Interactive vs. Runner section of the README with the one-time PATH setup line

What it solves (V7.2 pain points)

• Blocks your terminal — detach with Ctrl-b d, terminal is free, claude session keeps running
• Lost session on terminal crash — tmux keeps the process alive regardless of how the terminal dies
• No live visibility — sessions.log tail gives a real-time view of what the Conductor is doing without switching windows

What it intentionally does NOT do

• No worktree management (Claude Code handles that in .claude/worktrees/)
• No runner/automation integration (user prefers interactive, one-spec-at-a-time with PR review)
• No send-keys coordination between panes (that's the fragile path the v8 blueprint replaces)

Test plan

• chmod +x bin/archy-cockpit (already set in commit)
• Add ~/docs-to-code/bin to PATH
• Run archy-cockpit from inside a bootstrapped project — should open 3-pane session
• Detach (Ctrl-b d) and re-run archy-cockpit — should reattach, not create a second session
• Run from non-Archy dir — should print the ❌ Not an Archy project error and exit 1

https://claude.ai/code/session_01UHART3vXBeF7txW3Ae5PC6
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