NockGuard v0.12.0

Changed

• The Live Wall's empty view shows installed commands (nockguard wall --demo
  and nockguard proxy --upstream <command> --agent <name>) instead of a
  source-checkout go run, names the watched trail, and fills in the
  --agent the Wall was started with. The proxy command is always paired
  with nockguard wall --agent <name>, because a zero-config proxy writes the
  agent's own trail rather than the shared one. A filter that hides every row
  now shows "No rows match these filters" until a row matches or the filters
  clear.
• When its Guard trail file does not exist yet, the Live Wall prints a startup
  warning naming the path, /context reports trailExists: false, and the
  empty view reads "No trail file at yet" instead of looking like a
  healthy feed with no decisions.

Fixed

• A decision that reaches the Live Wall before /context loads no longer
  stops the page from filling in its export scope and other context fields.

Documentation

• Add examples/github-mcp-claude-code/: a copyable Claude Code setup that
  runs the GitHub MCP server under NockGuard and denies create_repository,
  fork_repository and delete_repository, with a policy test and a signed
  trail checked by nockguard verify.