DEVX-118: fix: use Gitea wiki dash-marker filename convention

Gitea appends a ".-" suffix before ".md" for wiki page titles that
contain dashes, to distinguish literal dashes from space-to-dash
conversions. For example, "Getting-Started" becomes
"Getting-Started.-.md", while "Architecture" becomes "Architecture.md".

Previously the code wrote "Getting-Started.md" which Gitea couldn't
recognize as a valid wiki page, causing verification to fail with
"page not found" for 15 of 21 pages.

Also force-push to handle concurrent CI runs that may have pushed to
the wiki repo between our clone and push.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

tests/unit/test_sync_wiki.py

@@ -19,6 +19,7 @@ from devx.ci.sync_wiki import (
     main,
     sync_files,
     transform_links,
+    wiki_filename,
 )
 
 
@@ -96,6 +97,29 @@ class TestGetWikiCloneUrl:
         assert "owner/repo.wiki.git" in url
 
 
+class TestWikiFilename:
+    def test_no_dashes(self) -> None:
+        assert wiki_filename("Home") == "Home.md"
+
+    def test_single_word(self) -> None:
+        assert wiki_filename("Architecture") == "Architecture.md"
+
+    def test_with_dashes_adds_marker(self) -> None:
+        assert wiki_filename("Getting-Started") == "Getting-Started.-.md"
+
+    def test_spaces_become_dashes_with_marker(self) -> None:
+        # "Getting Started" → "Getting-Started" (has dash) → marker added
+        assert wiki_filename("Getting Started") == "Getting-Started.-.md"
+
+    def test_spaces_no_dashes_no_marker(self) -> None:
+        # "Foo Bar" → "Foo-Bar" (has dash) → marker added
+        assert wiki_filename("Foo Bar") == "Foo-Bar.-.md"
+
+    def test_single_word_with_spaces_no_dash(self) -> None:
+        # No dash at all after conversion → no marker
+        assert wiki_filename("HelloWorld") == "HelloWorld.md"
+
+
 class TestCloneWiki:
     @patch("devx.ci.sync_wiki.subprocess.run")
     def test_clone_success(self, mock_run: MagicMock, tmp_path: Path) -> None: