docs: add external task runner integration pattern to protocol

chore: simplify marketplace.json — central marketplace at agentweave/plugins

fix: update landing page, privacy page, and gitignore for Shuttle protocol

chore: bump version to 0.4.0

fix: clean up stale work queue references and timestamp format

chore: update CLAUDE.md for docs/internal/ and mark spec as implemented

feat: update README for Shuttle protocol task format and per-agent subfolders

feat: update all adapters for per-agent task files and Shuttle format

feat: update /leave for Cortex prefix cron cleanup and hook removal

feat: update /join heartbeat with Shuttle protocol, idle suppression, collision detection

feat: update /register to create per-agent subfolders with tasks.md

feat: update /setup for per-agent subfolders and Shuttle task format

feat: adopt Shuttle Protocol task format in protocol spec

chore: gitignore assets/internal/ for promotional materials

chore: move agentweave logo to org repo (agentweave/.github)