fix: link the check commands from the pack pages

The get pages told a reader on another setup version to run `--check` after copying, with no command and no link, to someone holding a ZIP and no installer. The line now links the setup page's How to check section.

scripts/generate_site.py

@@ -679,9 +679,13 @@ def release_line(platform_name: str, record: dict) -> list[str]:
     return lines
 
 
-# What a reader on another version of the setup does with the pack. Our data
-# says which list the pack was made from, not what an older list lacks.
-OTHER_VERSION = "Other version? Run `--check` after copying."
+def other_version(platform_name: str, prefix: str = "../") -> str:
+    """What a reader on another version of the setup does with the pack.
+    Our data says which list the pack was made from, not what an older list
+    lacks. A bare `--check` was no command to run for someone holding a ZIP:
+    the line links the setup page's commands that check."""
+    target = f"{prefix}platforms/{platform_name}.md#how-to-check"
+    return f"Other version? [Check the files]({target}) after copying."
 
 
 def setup_version(platform_name: str, record: dict | None = None) -> str:
@@ -700,13 +704,15 @@ def setup_version(platform_name: str, record: dict | None = None) -> str:
     return f"{config.get('platform', platform_name)} {version.removeprefix('v')}"
 
 
-def version_line(platform_name: str, record: dict, named: bool = False) -> str:
+def version_line(platform_name: str, record: dict, named: bool = False,
+                 prefix: str = "../") -> str:
     """The version the pack fits, and what to do on another. *named* when
     the release line already named the pack's version."""
     made_from = setup_version(platform_name, record)
+    other = other_version(platform_name, prefix)
     if named or not made_from:
-        return OTHER_VERSION
-    return f"Made for {made_from}. {OTHER_VERSION}"
+        return other
+    return f"Made for {made_from}. {other}"
 
 
 # Why a setup has no ZIP, answered once on the FAQ.
@@ -793,7 +799,8 @@ def _pack_buttons(platform_name: str, label: str = "Pack", prefix: str = "../",
     )
     released = release_line(platform_name, record)
     return "\n\n".join([buttons, *released,
-                        version_line(platform_name, record, named=len(released) > 1)])
+                        version_line(platform_name, record, named=len(released) > 1,
+                                     prefix=prefix)])
 
 
 def generate_get_page(platform_name: str) -> str:

tests/test_site_entry.py

@@ -443,14 +443,22 @@ class PackNamesItsVersion(unittest.TestCase):
         block = generate_site._pack_buttons("batocera")
         version = generate_site._pack_version(release_record.pack_name_for("batocera", record))
         self.assertIn(f"Made for Batocera {version}. "
-                      + generate_site.OTHER_VERSION, block)
+                      + generate_site.other_version("batocera"), block)
 
     def test_a_version_gap_is_said_once(self):
         record = {"tag": "v2026.10.10", "packs": {"RetroBat_1.0_BIOS_Pack.zip": {
             "assets": ["RetroBat_1.0_BIOS_Pack.zip"], "platforms": ["retrobat"]}}}
         released = generate_site.release_line("retrobat", record)
         line = generate_site.version_line("retrobat", record, named=len(released) > 1)
-        self.assertEqual(line, generate_site.OTHER_VERSION)
+        self.assertEqual(line, generate_site.other_version("retrobat"))
+
+    def test_another_version_is_sent_to_the_check_commands(self):
+        """A ZIP reader read "Run `--check` after copying." with no command."""
+        line = generate_site.other_version("emudeck")
+        self.assertNotIn("Run `--check`", line)
+        self.assertIn("](../platforms/emudeck.md#how-to-check)", line)
+        page = _page("platforms/emudeck.md")
+        self.assertIn("{ #how-to-check }", page)
 
     def test_the_v_prefix_is_dropped(self):
         self.assertEqual(generate_site.setup_version("retroarch", {}),