The docs cover more than the coding agent, so they move from
packages/coding-agent/docs to docs/. Links into coding-agent files now use
the repository layout (../packages/coding-agent/examples/...).
The coding-agent build copies docs/ into packages/coding-agent/docs/
(generated, gitignored) with scripts/copy-docs.mjs and rewrites links into
the package back to package-relative paths. npm, the release binaries, Nix
and the evals image pack after the build, so releases keep shipping
<package>/docs unchanged. getDocsPath() returns the repository docs/ in
source checkouts.
