docs(workplans): add OPEN-WP-0003 and OPEN-WP-0004

OPEN-WP-0003: CLI validator for Integration Definition schema and index checks.
OPEN-WP-0004: Portfolio survey and registration of additional integrations.

workplans/OPEN-WP-0004-integration-portfolio-registration.md

@@ -0,0 +1,81 @@
+---
+id: OPEN-WP-0004
+type: workplan
+title: "Integration portfolio registration"
+domain: infotech
+repo: open-reuse
+status: ready
+owner: codex
+topic_slug: infotech
+created: "2026-06-24"
+updated: "2026-06-24"
+---
+
+# Integration portfolio registration
+
+Grow `registry/indexes/integrations.yaml` beyond the markitect-quarkdown
+reference entry. Survey the portfolio for proven OSS integrations, coordinate
+definition authoring in consuming repositories, and register discovery rows in
+open-reuse.
+
+## Design decisions
+
+- **Source of truth:** Integration definitions live in consuming repos;
+  open-reuse holds the discovery index only (per PRD open question 7).
+- **Entry bar:** Only integrations that have **proven value** in practice —
+  open-reuse does not register experiments or planned work.
+- **Dependency:** Prefer `open-reuse validate` from OPEN-WP-0003 for final
+  verification; manual checklist is acceptable until that workplan completes.
+
+## Survey portfolio candidates
+
+```task
+id: OPEN-WP-0004-T01
+status: todo
+priority: high
+```
+
+Scan the local repo portfolio (reuse-surface `local-repo-roster.yaml`, domain
+`INTENT.md` files, and existing `*.integration.yaml` files) for proven
+integrations not yet indexed. Produce a short candidate list with owner repo,
+upstream project, reuse mode estimate, and registration readiness
+(ready / needs-definition / needs-boundary-work).
+
+## Prioritize and assign targets
+
+```task
+id: OPEN-WP-0004-T02
+status: todo
+priority: high
+```
+
+Select 2–3 candidates for registration in this workplan cycle. Record the
+selection and rationale in the task result. Defer remaining candidates to
+backlog with explicit blockers.
+
+## Author integration definitions
+
+```task
+id: OPEN-WP-0004-T03
+status: todo
+priority: high
+```
+
+For each selected candidate, ensure a conforming Integration Definition exists
+in the consuming repo at `integration/<id>.integration.yaml` using
+`templates/integration-entry.template.yaml`. Complete at minimum: upstream,
+reuse classification, boundary, validation harness, and maintainers. Coordinate
+PRs in owning repos where definitions are missing.
+
+## Expand registry index
+
+```task
+id: OPEN-WP-0004-T04
+status: todo
+priority: medium
+```
+
+Add index rows to `registry/indexes/integrations.yaml` for each registered
+integration. Update `registry/README.md` reference section. Run
+`open-reuse validate` (or manual checklist) and confirm all new rows pass
+promotion gates for `registered` or `active` status.