feat: watch the release page of off-forge profiles

About forty profiles describe projects published outside any forge (Altirra, ePSXe, DraStic, mednafen, xroar). profile_sync skipped them as an unsupported host and check_freshness reported the same UNKNOWN line every run, so a new release adding a firmware went unseen. A profile can now name the page announcing its releases and a pattern for the version: --check-version reads it, and check_freshness --profiles calls the profile stale when the page announces another version than core_version.

tests/test_check_freshness.py

@@ -422,5 +422,20 @@ class RowsSayAllTheyStandFor(unittest.TestCase):
         self.assertIn("--json lists all 50", row.detail)
 
 
+class AReleasePageMakesAProfileStale(unittest.TestCase):
+    def test_a_newer_announced_version_is_stale(self):
+        import check_freshness
+
+        rows = [
+            {"name": "altirra", "skipped": "unsupported host: x",
+             "declared_version": "4.40", "page_version": "4.50"},
+            {"name": "mednafen", "skipped": "unsupported host: y",
+             "declared_version": "1.32.1", "page_version": "1.32.1"},
+        ]
+        found = {f.subject: f.status for f in check_freshness.summarize_profile_sync(rows)}
+        self.assertEqual(found["altirra"], check_freshness.STALE)
+        self.assertEqual(found["mednafen"], check_freshness.OK)
+
+
 if __name__ == "__main__":
     unittest.main()

tests/test_profile_sync.py

@@ -4253,5 +4253,20 @@ class StrictRefusesAnUncheckableProfile(unittest.TestCase):
         self.assertFalse(report("no source_ref").uncheckable())
 
 
+class AnOffForgeProfileWatchesItsReleasePage(unittest.TestCase):
+    """Profiles of projects outside any forge were skipped as an unsupported
+    host, and a new release of Altirra or mednafen went unseen."""
+
+    def test_the_page_version_is_read(self):
+        from unittest import mock
+
+        profile = {"emulator": "Altirra", "core_version": "4.40", "version_source": {
+            "url": "https://example.test/altirra", "pattern": r"Altirra (\d+\.\d+) released",
+        }}
+        with mock.patch.object(profile_sync.upstream, "fetch_page",
+                               return_value="<p>Altirra 4.50 released</p>"):
+            self.assertEqual(profile_sync.page_version(profile, "cache", False), "4.50")
+
+
 if __name__ == "__main__":
     unittest.main()