Expand description
Implementation of the zad docs [topic] subcommand mandated by
OSS_SPEC.md §12.3.
Every topic doc under docs/*.md is embedded into the binary via
include_str! so the exact text a contributor ships is the exact
text an agent sees at runtime — no filesystem lookups, no version
skew between the installed binary and the source tree.
Paths resolve through the crates/zad-cli/docs symlink, which
points at ../../docs (the canonical docs tree at the repo root).
The symlink is resolved when cargo packages the crate, so the
published tarball ships the doc files as real entries and the
cargo publish verify step can compile the package outside the
workspace. Don’t replace the symlink with copies — that would
immediately drift from the canonical docs.