Canopy framework execution engine. Interprets canopy-flavored skills (any SKILL.md with a `## Tree` section) at runtime — platform detection, section semantics (`## Agent`/`## Tree`/`## Rules`/`## Response:`), tree notation (`<<`, `>>`, `|`), control-flow primitives (`IF`/`ELSE_IF`/`ELSE`/`SWITCH`/`CASE`/`DEFAULT`/`FOR_EACH`/`BREAK`/`END`), interaction primitives (`ASK`/`SHOW_PLAN`), execution primitives (`EXPLORE`/`VERIFY_EXPECTED`), op lookup chain, category directory semantics, subagent contract. Install this to execute existing canopy skills. Install `canopy` (the authoring agent) too if you need to create/edit/manage them.
