v0.7.5: change control, record first

Change control for AI agents: the record comes first

• The README, demo GIF, Claude Code plugin, plugin marketplace and MCP registry listing now say what Squidbrake is: a record of every change your agents make (which agent, what changed, who signed off, what led to it), sign-off by a second person for risky changes, and an undo for destructive ones.
• The weekly Slack summary now opens with what people signed off on, then what the agents did.
• New example policy for agents that run with nobody watching (nightly loops, cron jobs, Routines): examples/rules/unattended-agent.yaml. Every action goes on the record; the agent stays in its own lane (reads plus a short list of writes); it can't redo work or repeat something a person rejected; deletes, money out and irreversible commands are refused because nobody is awake to sign off; and a stuck loop stops after 200 steps. It ships in shadow mode.

Upgrade: pipx upgrade squidbrake