REUSE-WP-0017-T01: explicit capability_status on roster + coverage split in report gaps

Adds capability_status: has|none|pending to every roster row (10 has /
51 pending currently), a coverage_ratio headline, and splits the gap
report's empty-scaffold section into unclassified vs explicitly-none.
Adds templates/NO_CAPABILITIES.template.md for the no-capability marker.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/test_stats.py

@@ -29,8 +29,8 @@ def test_collect_roster_stats_federation_ready():
     root = Path(__file__).resolve().parent.parent
     roster = root / "registry/federation/local-repo-roster.yaml"
     stats = collect_roster_stats(roster, federation_ready=True)
-    assert stats["counts"]["total"] == 60
-    assert stats["counts"]["established"] == 60
+    assert stats["counts"]["total"] == 61
+    assert stats["counts"]["established"] == 61
     assert "federation_readiness" in stats
     text = format_roster_stats_markdown(stats)
     assert "publish pass ratio" in text