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>

reuse_surface/reports.py

@@ -110,6 +110,9 @@ def collect_gap_report(
         r for r in repos
         if r.get("status") == "established" and r.get("capability_count", 0) == 0
     ]
+    unclassified = [r for r in empty_scaffolds if r.get("capability_status", "pending") == "pending"]
+    explicit_none = [r for r in empty_scaffolds if r.get("capability_status") == "none"]
+    covered = [r for r in repos if r.get("capability_status") in ("has", "none")]
     seeded = [r for r in repos if r.get("seed_from_reuse_surface")]
     dedup_pending = [
         {
@@ -133,6 +136,11 @@ def collect_gap_report(
         ],
         "empty_scaffold_count": len(empty_scaffolds),
         "empty_scaffolds": [r["slug"] for r in empty_scaffolds],
+        "unclassified_count": len(unclassified),
+        "unclassified": [r["slug"] for r in unclassified],
+        "explicit_none_count": len(explicit_none),
+        "explicit_none": [r["slug"] for r in explicit_none],
+        "coverage_ratio": f"{len(covered)}/{len(repos)}" if repos else "0/0",
         "seeded_repos": [
             {
                 "slug": r["slug"],
@@ -180,11 +188,23 @@ def format_gap_markdown(report: dict[str, Any]) -> str:
         lines.append("- none (owner rows migrated to canonical repos)")
     lines.append("")
 
-    empty_count = report.get("empty_scaffold_count", 0)
-    lines.append(f"## Empty scaffolds ({empty_count})")
-    slugs = report.get("empty_scaffolds", [])
-    if slugs:
-        for slug in slugs:
+    lines.append(f"**Capability coverage:** {report.get('coverage_ratio', '?')} "
+                 "(repos with a capability or an explicit no-capability marker)")
+    lines.append("")
+
+    unclassified = report.get("unclassified", [])
+    lines.append(f"## Unclassified scaffolds ({report.get('unclassified_count', len(unclassified))})")
+    if unclassified:
+        for slug in unclassified:
+            lines.append(f"- `{slug}`")
+    else:
+        lines.append("- none")
+    lines.append("")
+
+    explicit_none = report.get("explicit_none", [])
+    lines.append(f"## Explicitly no-capability ({report.get('explicit_none_count', len(explicit_none))})")
+    if explicit_none:
+        for slug in explicit_none:
             lines.append(f"- `{slug}`")
     else:
         lines.append("- none")