Make repo-root `skills/` and `agents/` the canonical source for the
`sentry-skills` plugin by loading the plugin from repo root instead of
from `plugins/sentry-skills`.
The earlier refactor moved the tree to top level, but leaving a
plugin-local `skills` symlink still created a loader risk for
marketplace installs. This removes that dependency entirely: the
marketplace entry now points at `./`, the root plugin manifest uses
repo-root `skills/` and `agents/`, and the old plugin-local `skills`
path goes away.
This pass also tightens the repo guidance around standard skill
locations. `skill-writer` goes back to using `.agents/skills` as its
default local target, `skill-writer` and `skill-scanner` now explicitly
recognize canonical `skills/<name>/` roots, and the repo docs and
registrations are updated to match the new layout, including
`presentation-creator`.
I validated the change with strict-depth validation for `skill-writer`
and `skill-scanner`, plus a local Claude marketplace add/install smoke
test that produced real `skills/` and `agents/` directories in the
installed plugin cache without any plugin-local `skills` symlink.
---------
Co-authored-by: Codex <noreply@openai.com>
Co-authored-by: Codex <codex@openai.com>
David Cramer