fix: date prose by its citations, not its wording

A note reworded around unchanged citations took the rewording commit as its writing revision. That commit's pin is current, so citations a bump had left behind stopped being reported. A sentence end now separates a project word from the citation before it, like a comma.

scripts/profile_sync.py

@@ -383,8 +383,9 @@ def _walk_document(
 
 # What separates one citation from the next in prose. lynx-emu writes
 # "...:112; mednafen src/lynx/system.cpp:86-93": without the semicolon the
-# project word read as prose and the citation was charged to the fork.
-_PROSE_LIST_DELIMITERS = ",;:("
+# project word read as prose and the citation was charged to the fork. A
+# sentence end separates them the same way.
+_PROSE_LIST_DELIMITERS = ",;:(."
 
 
 def _prose_external(
@@ -2845,6 +2846,26 @@ def _pin_of(document: dict, field: str, mode: str = "") -> str | None:
     return value if isinstance(value, str) and value else None
 
 
+_CITATION_RUN_RE = re.compile(
+    PROSE_CITE_RE.pattern + r"(?:, *\d+(?:-\d+)?)*"
+)
+
+
+def _scalar_citations(text: str | None) -> tuple[str, ...] | None:
+    """The citations a scalar carries, in order, without the prose around them.
+
+    A note reworded around unchanged citations was still written under the
+    pin those citations describe: comparing whole texts moved the writing
+    revision to the rewording commit, whose pin is current, and the stale
+    citations were never offered for realignment again.
+    """
+    if text is None:
+        return None
+    return tuple(
+        _citation_key(m.group(0)) for m in _CITATION_RUN_RE.finditer(text)
+    )
+
+
 def _writing_pins(
     revisions: list[tuple[str, dict]], intro_sha: str, field: str, mode: str = ""
 ) -> list[str]:
@@ -3098,7 +3119,9 @@ def realign_prose(
         for field in fields:
             if not alive[field]:
                 continue
-            if values.get(field) == current_values.get(field):
+            if _scalar_citations(values.get(field)) == _scalar_citations(
+                current_values.get(field)
+            ):
                 intro[field] = sha
             else:
                 alive[field] = False

tests/test_profile_sync.py

@@ -3141,6 +3141,7 @@ class TestCollectCitations(unittest.TestCase):
         for line in (
             "see Lynx.emu/src/lynx/system.cpp:112; mednafen src/lynx/system.cpp:86-93",
             "see Lynx.emu/src/lynx/system.cpp:112, mednafen src/lynx/system.cpp:86-93",
+            "see Lynx.emu/src/lynx/system.cpp:112. mednafen src/lynx/system.cpp:86-93",
         ):
             with self.subTest(line=line):
                 start = line.index("src/lynx/system.cpp:86")
@@ -3718,6 +3719,27 @@ class TestRealignProse(unittest.TestCase):
         )
         self.assertEqual(self.path.read_text(), before)
 
+    def test_rewording_around_citations_keeps_the_writing_pin(self):
+        """Punctuation edited in a note after a bump is not a new writing.
+
+        Keyed on the whole text, the rewording commit became the writing
+        revision, its pin was current, and the bump that had left the
+        citations behind was no longer reported.
+        """
+        self._repo_with_advanced_pin()
+        self._commit(PROSE_SAMPLE, "advance the pin")
+        self._commit(
+            PROSE_SAMPLE.replace("on boot.", "at boot."), "reword the note"
+        )
+        self.files[("oldpin", "a.c")] = ["x"] * 9 + ["subject"]
+        self.files[("pin", "a.c")] = ["x"] * 13 + ["subject"]
+        self.files[("oldpin", "b.c")] = list("pqrstuvwx")
+        self.files[("pin", "b.c")] = list("pqrstuvwx")
+        messages = profile_sync.realign_prose(self.path, self.tmp.name, dry_run=True)
+        self.assertTrue(
+            any("pin moved under this text" in m for m in messages), messages
+        )
+
     def test_a_citation_in_an_unmoved_upstream_needs_no_reading(self):
         """nethersx2 cites AetherSX2 files that only its upstream carries,
         at an upstream pin that never moved. The port's pin did move under