Add portfolio management docs

[nscuro]

No description provided.

[Copilot]

Pull request overview

Adds a portfolio-management documentation set: a new About projects concept page, a companion About tags concept page, two user guides (organizing hierarchies, managing versions), one administration guide (project retention), a new Projects reference page, and small cross-link/contract updates so existing pages point into the new set.

Changes:

• New Concepts pages for projects and tags, plus cross-links from access-control, component-policies, vulnerability-policies, and changes-in-v5.
• New user guides for organizing projects into hierarchies and managing project versions, plus a new admin guide for project retention; registered in their respective .pages nav files.
• New reference/projects.md (classifiers, collection logic, identity/identifiers, tags/properties, retention controls) and a "Surface language" section added to context/diataxis-contract.md.

Reviewed changes

Copilot reviewed 17 out of 29 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
docs/concepts/projects.md	New concept page covering the project model, hierarchy, collection projects, versions, retention, ACL.
docs/concepts/tags.md	New concept page describing tags and how they differ from project properties.
docs/concepts/access-control.md	Adds a "See also" link to the new projects concept page.
docs/concepts/component-policies.md	Links "tags" to the new tags concept page.
docs/concepts/vulnerability-policies.md	Links "project tags" to the new tags concept page.
docs/concepts/changes-in-v5.md	Documents the new retention policies as a v5 change.
docs/concepts/.pages	Registers the two new concept pages in the nav.
docs/guides/user/organizing-projects.md	New guide on parents, collection projects, and collection logic.
docs/guides/user/managing-project-versions.md	New guide on cloning versions, the latest flag, retiring versions, retention.
docs/guides/user/.pages	Registers the two new user guides.
docs/guides/administration/configuring-project-retention.md	New admin guide for the retention maintenance task.
docs/guides/administration/.pages	Registers the retention admin guide.
docs/reference/projects.md	New reference page (classifiers, collection logic, identity, identifiers, tags/properties, retention).
docs/reference/permissions.md	Adds cross-links to the two new portfolio user guides.
docs/reference/badges.md	Notes UUID/(name, version)/name-only badge URL resolution.
docs/reference/.pages	Registers the new projects reference page.
context/diataxis-contract.md	Adds a "Surface language" section governing UI vs. API/config vocabulary per Diataxis type.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 18 out of 30 changed files in this pull request and generated no new comments.