Add agent project constellation guides and link policy

dotfiles/agents/project-guides/mova-org-agenda-api.md

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+# Mova / org-agenda-api constellation
+
+## Scope
+- Use this guide for requests involving the mova constellation, including `org-agenda-api`.
+- Primary anchor is the mova root repo; start there and branch out.
+
+## Related packages/projects (trigger list)
+- If any of these names are mentioned, open this guide for context.
+- `mova-dev`: coordination repo for the mova ecosystem and cross-repo workflows.
+- `mova`: React Native app (iOS/Android/Web).
+- `org-agenda-api`: Emacs Lisp HTTP API and deployment container.
+- `org-window-habit`: habit-tracking logic used by org workflows.
+- `org-wild-notifier`: org notification logic and scheduling behavior.
+- `dotfiles` (within mova-dev context): infra/config and deployment glue for org-agenda-api.
+
+## Symlink targets
+- `./project-links/mova-dev` -> mova constellation root.
+
+## Discovery hints
+- Check likely roots first, especially `~/Projects`.
+- Common local path is `~/Projects/mova-dev`, but do not assume it exists.
+- If the symlink is missing or stale, search by directory name first, then by repo names.
+
+## Read-first docs
+- `./project-links/mova-dev/README.md`
+- `./project-links/mova-dev/org-agenda-api/README.md` (if present)
+
+## Notes
+- Prefer treating mova root docs as canonical project context.