Complete WP-0006 through WP-0009: registry expansion, catalog, graph, tests

Register six new capabilities (12 total), add searchable catalog UI and graph
explorer, introduce pytest suite with CI fail-on-warnings, and close gap
analysis priorities 13 and 16. WP-0010 remains backlog for network federation.

workplans/REUSE-WP-0009-cli-hardening.md

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+---
+id: REUSE-WP-0009
+type: workplan
+title: "CLI hardening and test suite"
+domain: helix_forge
+repo: reuse-surface
+status: finished
+owner: codex
+topic_slug: helix-forge
+created: "2026-06-15"
+updated: "2026-06-15"
+state_hub_workstream_id: "9121d16f-879f-4db3-9df6-06f7543481d8"
+---
+
+# CLI hardening and test suite
+
+Raise registry tooling reliability toward R3 with automated tests and stricter
+CI gates after WP-0006 relation hygiene.
+
+## Add pytest Suite
+
+```task
+id: REUSE-WP-0009-T01
+status: done
+priority: high
+state_hub_task_id: "57d0869a-38bb-409a-b5b1-b3c73ff31a96"
+```
+
+Add `tests/` covering validate, query, export, overlaps, federation compose,
+graph, and catalog commands. Add `[dev]` optional deps and document
+`.venv/bin/pytest` in `AGENTS.md`.
+
+## Add Fail-On-Warnings Flags
+
+```task
+id: REUSE-WP-0009-T02
+status: done
+priority: high
+state_hub_task_id: "d10fde06-e09b-4292-b6c8-ced5e5ef213c"
+```
+
+Add `--fail-on-warnings` to `validate` and `graph --check`. Use in CI once
+WP-0006 relation hygiene is complete.
+
+## Tighten CI Pipeline
+
+```task
+id: REUSE-WP-0009-T03
+status: done
+priority: medium
+state_hub_task_id: "79c0fa70-7ec1-4762-9a7c-9783f0997016"
+```
+
+Update `.gitea/workflows/ci.yml` to run pytest and fail on relation warnings.
+Record reliability evidence on `capability.registry.register`.