test: version guard reads pyproject instead of a hard-coded literal

test_package_version_helper_reads_the_project_version asserted the literal
'1.12.8', so it failed on this release for a reason unrelated to what it
guards. Its job is 'does the helper report the PROJECT version', not 'is the
version 1.12.8'.

Now reads the expected value from pyproject.toml, so it keeps testing the
helper and stops needing a hand-edit every release.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JKAExynd9zoKwt6rYA66EA

Author: karlwaldman

tests/test_release_readiness.py

@@ -170,7 +170,13 @@ def test_package_version_helper_reads_the_project_version() -> None:
         capture_output=True,
         text=True,
     )
-    assert result.stdout.strip() == "1.12.8"
+    # Read the expected value from pyproject rather than hard-coding it. The
+    # helper's job is "does it report the PROJECT version", not "is the version
+    # 1.12.8" — pinning the literal made this test fail on every release for a
+    # reason unrelated to what it guards.
+    pyproject = (ROOT / "pyproject.toml").read_text()
+    expected = re.search(r'^version = "([^"]+)"', pyproject, re.M).group(1)
+    assert result.stdout.strip() == expected
 
 
 def test_every_workflow_pins_actions_and_hardens_each_checkout_step() -> None: