recon: add /api/wiki-enrich endpoint (extraction #5 prep, additive) (#8)

HTTP wrapper over the wiki_index lookup so the (future) navi-places service can
fetch wiki enrichment over HTTP instead of reading recon's 2.1 GB
data/wiki_index.db directly (Phase A option B — HTTP coupling).

  GET /api/wiki-enrich?wikidata=<Qid>           (primary key)
  GET /api/wiki-enrich?name=<name>&country=<cc>  (fallback key)
  -> 200 {wiki_summary?, wiki_population?, wiki_url?, wikivoyage_url?}
  -> 400 if no usable key; 404 on no match. Public (no auth, like /api/place/*).

Route keys are wikidata_id / name+country — NOT osm_type/osm_id — because that
is how wiki_index is actually queried (the in-process _enrich_with_wiki_index
looks up by result['wikidata_id'] then name+country_code, never by OSM id; see
extraction-5-wiki-enrich-investigation.md). An osm-keyed route would have forced
a redundant in-recon place lookup.

Changes (additive only):
  - lib/place_detail.py: new standalone lookup_wiki_index(wikidata_id, name,
    country_code) doing the same two SELECTs + field/URL mapping as the
    in-process path, returning a dict or None. Pure DB read, never raises.
    `_enrich_with_wiki_index` is LEFT UNTOUCHED — it can be DRY-refactored to
    delegate to this in a later PR; the in-process enrichment path is unchanged.
  - lib/wiki_enrich_api.py: new wiki_enrich_bp blueprint with the route.
  - lib/api.py: register the blueprint (one block).
  - lib/wiki_enrich_api_test.py: 4 tests (hit-by-wikidata + decoded fields,
    no-match -> 404, name+country fallback, no-key -> 400) over an in-memory
    fixture DB; plain-assert style + __main__ runner (recon venv has no pytest).
    Verified green against recon's venv (flask 3.1.2).

Does NOT remove the in-process _enrich_with_wiki_index call from place_detail —
that happens in a later PR once navi-places is live and serving.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lib/wiki_enrich_api_test.py

@@ -0,0 +1,77 @@
+"""Tests for the /api/wiki-enrich endpoint (extraction #5 prep).
+
+Plain-assert style (matching the other lib *_test.py; recon's venv has no
+pytest). Builds a minimal Flask app with only wiki_enrich_bp registered (avoids
+importing the full recon app) and points place_detail's lazy wiki_index
+connection at an in-memory fixture DB. Run with pytest, or directly:
+    python -m lib.wiki_enrich_api_test
+"""
+import sqlite3
+
+from flask import Flask
+
+from lib import place_detail
+from lib.wiki_enrich_api import wiki_enrich_bp
+
+
+def _client():
+    """Fresh in-memory wiki_index fixture + a minimal app with just the route."""
+    conn = sqlite3.connect(":memory:", check_same_thread=False)
+    conn.row_factory = sqlite3.Row
+    conn.execute(
+        "CREATE TABLE wiki_places (wikidata_id TEXT, place_name TEXT, country_code TEXT, "
+        "summary TEXT, wiki_population TEXT, wikipedia_title TEXT, wikivoyage_title TEXT)"
+    )
+    conn.execute(
+        "INSERT INTO wiki_places VALUES (?,?,?,?,?,?,?)",
+        ("Q830149", "Filer", "us", "A city in Idaho.", "2508", "Filer, Idaho", "Filer"),
+    )
+    conn.commit()
+    # Point the lazy module-level connection at the fixture so
+    # _get_wiki_index_db()/lookup_wiki_index() use it (bypasses the file path).
+    place_detail._wiki_index_conn = conn
+    app = Flask(__name__)
+    app.register_blueprint(wiki_enrich_bp)
+    return app.test_client()
+
+
+def test_wiki_enrich_hit_by_wikidata():
+    resp = _client().get("/api/wiki-enrich?wikidata=Q830149")
+    assert resp.status_code == 200, resp.status_code
+    d = resp.get_json()
+    assert d["wiki_summary"] == "A city in Idaho."
+    assert d["wiki_population"] == 2508  # cast to int
+    assert d["wiki_url"] == "https://en.wikipedia.org/wiki/Filer,_Idaho"
+    assert d["wikivoyage_url"] == "https://en.wikivoyage.org/wiki/Filer"
+
+
+def test_wiki_enrich_no_match_404():
+    resp = _client().get("/api/wiki-enrich?wikidata=Q9999999")
+    assert resp.status_code == 404, resp.status_code
+
+
+def test_wiki_enrich_name_country_fallback():
+    resp = _client().get("/api/wiki-enrich?name=Filer&country=US")
+    assert resp.status_code == 200, resp.status_code
+    assert resp.get_json()["wiki_summary"] == "A city in Idaho."
+
+
+def test_wiki_enrich_no_key_400():
+    c = _client()
+    assert c.get("/api/wiki-enrich").status_code == 400
+    # name without country is not a usable key
+    assert c.get("/api/wiki-enrich?name=Filer").status_code == 400
+
+
+if __name__ == "__main__":
+    failures = 0
+    for _name, _fn in sorted(globals().items()):
+        if _name.startswith("test_") and callable(_fn):
+            try:
+                _fn()
+                print(f"PASS {_name}")
+            except Exception as exc:  # noqa: BLE001
+                failures += 1
+                print(f"FAIL {_name}: {exc!r}")
+    print("OK" if failures == 0 else f"{failures} FAILED")
+    raise SystemExit(1 if failures else 0)