feat: participation and RACI labels, written on the project page (#118)

Files changed:
- CHANGES.md
- VERSION
- instructions/gtd-weekly-review/SKILL.md
- instructions/link-taxonomy.md
- kb/entities/COLLECTION.md
- kb/gtd/COLLECTION.md
- types/project.md

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

instructions/gtd-weekly-review/SKILL.md

@@ -72,10 +72,12 @@ surface, lives in `docs/knowledge-and-commitment.md`, which this skill does not
    skill exists precisely because that join is not automatic.
 
 4. **Mentions of people stay mentions.** A person named in `## Beteiligte` while working through a
-   finding does **not** get a page or a `[[wikilink]]`, however much this pass is about them - a
-   page is earned only once they matter for the knowledge independent of this one initiative
-   (`types/project.md` § Authoring guidance). Creating one here, out of the habit of linking what
-   gets mentioned, is the mistake this step exists to head off.
+   finding does **not** get a page, however much this pass is about them - a page is earned only
+   once they matter for the knowledge independent of this one initiative (`types/project.md`
+   § Authoring guidance). Creating one here, out of the habit of linking what gets mentioned, is
+   the mistake this step exists to head off. Someone who already has a page is the other case,
+   and the same section says what it takes: a `[[wikilink]]` on the mention and a participation
+   edge on the project page.
 
 5. **Close out.** If any page changed, `instructions/publish-cycle.md`. A pass that only changed
    tracker state (the user acted on option (a)/(b) above without touching `kb/`) publishes