Add the Commons reference-board research tool

TODO.md

@@ -348,10 +348,13 @@ CC BY-SA 2.0). No recent frame shoots the El Capitan facade straight-on in dayli
 facade evidence is still the 2009 CC BY frame. The 8 downloaded candidates are in
 `tmp/research/elcapitan-2026/` (gitignored) with `meta.json`; nothing was committed.
 
-- [ ] Wire `scene_concepts.py refboard`: list/fetch Commons files by `titles=`, `geosearch` or
-      category with date and licence sorting, write the `SIDECAR.md` rows and the folder README
-      rows automatically (User-Agent, batched `titles=`, 3–4 s spacing to avoid HTTP 429; date-only
-      fetch into `tmp/` by default, committed copies require the licence gate).
+- [x] Wire `tools/refboard.py` (standalone, stdlib-only): `search --source search|geo|category`
+      lists candidates with ISO date, age-in-months and a commit/review/skip licence gate
+      (`--allow-ccbysa` after a recorded review); `fetch` downloads usable rows into `tmp/` with
+      spaced requests and writes `meta.json`; `rows` emits SIDECAR + README table rows from the
+      manifest. Six recent CC0 photos of the block were re-fetched into
+      `tmp/research/elcapitan-2026-tool/`. Tests in `tools/test_refboard.py` (licence gate, recent
+      filter, review-row exclusion, row emission).
 - [ ] Add a `--max-age-months` filter (default 12) and a `--must-reuse` mode that matches the
       folder's existing sidecar entries so a refresh only reports what changed.
 - [ ] Research-diff step: keep the last-12-months board as the "current reality" evidence and the