Add session manifest for tracking new and updated sessions

Fix command syntax: /collect not /project:collect

Add Vannevar Bush attribution to README subtitle

Simplify Multi-Machine Sync: SSH-first, Tailscale optional

Expand Multi-Machine Sync with step-by-step SSH/Tailscale setup

Remove author information from README.md

Update Quick Start: fork-first workflow

Add citation, author, and MIT license file

Initial release: portable identity for Claude Code