Squash Odysseus development history

tests/test_readme_ascii_fenced.py

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+"""Regression guard for the README title presentation.
+
+Originally (#1390) the README opened with an ASCII-art banner that had to live
+inside a ``` code fence, otherwise GitHub's markdown collapsed its leading
+whitespace and box-drawing rules and rendered it misaligned. The README refresh
+(#4306) dropped that banner in favour of a centered wordmark image, so the guard
+now pins the wordmark identity instead, while still catching the original failure
+mode if an un-fenced ASCII banner is ever reintroduced.
+"""
+from pathlib import Path
+
+README = Path(__file__).resolve().parent.parent / "README.md"
+
+# Box-drawing rule from the legacy ASCII banner (the #1390 failure mode).
+_RULE = "─" * 10
+
+
+def _fenced_segments(text: str):
+    """Return the segments of *text* that sit INSIDE ``` fences."""
+    parts = text.split("```")
+    # parts[0] is before the first fence, parts[1] is inside the first fence, ...
+    return parts[1::2]
+
+
+def test_readme_opens_with_wordmark_title():
+    # The README must still open with a recognizable Odysseus title: now the
+    # centered wordmark image rather than an H1 / ASCII banner.
+    head = "\n".join(README.read_text(encoding="utf-8").splitlines()[:15])
+    assert 'alt="Odysseus"' in head, "README must open with the Odysseus wordmark image"
+
+
+def test_reintroduced_ascii_banner_stays_fenced():
+    # Defensive: if a box-drawing banner is ever added back, it must be fenced so
+    # GitHub renders it monospace-as-typed (the original #1390 regression).
+    text = README.read_text(encoding="utf-8")
+    if _RULE not in text:
+        return
+    inside = "\n".join(_fenced_segments(text))
+    assert _RULE in inside, "ASCII banner rule must be inside a ``` code fence"