Covers top-level .name invocation, the new description/isolated macro
fields (with the non-isolation persistence, fail-fast, nested-macro, and
.exit caveats), workspace .coyote/macros/ + --no-workspace-macros,
enabled_macros scoping at global/role/agent/session levels, and
.macro enable|disable across the README and every example config.
graph.example.yaml gains a note that enabled_macros is ignored in graph
configs.
CHANGELOG intentionally untouched: it is generated by commitizen at
release time from the conventional commit subjects.
Implements plans/custom-commands-design.md §8.
Dark-Alex-17