Adds cmd/hyperguild/README.md (subcommands, env vars, install path)
and three Taskfile targets:
task hyperguild:dev — go run from source
task hyperguild:build — build into ./bin/hyperguild
task hyperguild:install — go install into $GOBIN
Concludes Plan 4 of the hyperguild migration. The binary replaces
the supervisor's tier MCP and surfaces brain HTTP REST access plus
mode bootstrap to shell pipelines and ad-hoc agent prompts.
eab8775f5f