fix(viewer): decode percent-encoded link targets in _extract_links

okf/src/reference_agent/viewer/generator.py

@@ -2,6 +2,7 @@
 
 import json
 import re
+from urllib.parse import unquote
 from dataclasses import dataclass, field
 from pathlib import Path
 from typing import Any
@@ -70,7 +71,7 @@ def _extract_links(body: str, doc_dir: Path, bundle_root: Path) -> list[str]:
     seen: set[str] = set()
     bundle_root_resolved = bundle_root.resolve()
     for m in _LINK_RE.finditer(body):
-        target = m.group(1)
+        target = unquote(m.group(1))
         if "://" in target or target.startswith("/"):
             continue
         try:

okf/tests/test_viewer.py

@@ -187,3 +187,36 @@ def test_v02_signals_appear_in_graph_payload(tmp_path: Path):
 def test_raises_when_bundle_missing(tmp_path: Path):
     with pytest.raises(FileNotFoundError):
         generate_visualization(tmp_path / "nope", tmp_path / "viz.html")
+
+def test_percent_encoded_links_produce_edges(tmp_path: Path):
+    bundle = tmp_path / "bundle"
+    _write(
+        bundle / "metrics" / "gross margin.md",
+        """
+        ---
+        type: Reference
+        title: Gross Margin
+        description: Gross margin metric.
+        generated: {by: 'reference_agent/gemini', at: '2026-05-28T00:00:00+00:00'}
+        ---
+        The gross margin metric.
+        """,
+    )
+    # links using %20 (percent-encoded space) — the bug case
+    _write(
+        bundle / "tables" / "orders.md",
+        """
+        ---
+        type: BigQuery Table
+        title: Orders
+        description: Orders table.
+        generated: {by: 'reference_agent/gemini', at: '2026-05-28T00:00:00+00:00'}
+        ---
+        See [gross margin](../metrics/gross%20margin.md).
+        """,
+    )
+    out = tmp_path / "viz.html"
+    generate_visualization(bundle, out)
+    data = _extract_bundle_data(out.read_text(encoding="utf-8"))
+    pairs = {(e["data"]["source"], e["data"]["target"]) for e in data["edges"]}
+    assert ("tables/orders", "metrics/gross margin") in pairs