fix(6477): a plain-word call needs the parenthesis right after the word

Read against Fabled Archives after the cleanup: of the 9 rows still linked
to snippet #5448 (symbol `file`), all but one matched prose in a comment,
"a file (not a directory)", "the file (ScanWaiting". The only real call
was `r.file(ctx, ...)`. Formatted code never puts a space before a call's
parenthesis and prose does, so the plain-word test is now `word(` with no
whitespace. _PROPOSER_VERSION 8 re-reads every row once.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_shape_ledger.py

@@ -601,7 +601,9 @@ def test_a_plain_word_counts_only_where_it_is_called():
     from grimoire.services.shape_ledger import Canon, _norm_text, reference_canons
     seen = Canon(8, "sym", "seen", (("src/tree.py", "seen"),), "def seen(f):", _norm_text("x"), 2, "python")
     assert reference_canons("sym", "src/a.py", "walk", "if path in seen:\n    return", [seen]) == []
-    assert reference_canons("sym", "src/a.py", "walk", "if seen (f):\n    return", [seen]) == [8]
+    assert reference_canons("sym", "src/a.py", "walk", "if seen(f):\n    return", [seen]) == [8]
+    # Prose puts a space before the parenthesis; a call does not.
+    assert reference_canons("sym", "src/a.py", "walk", "// a seen (or unseen) path\nreturn p", [seen]) == []
     # A leading underscore does not get a generic verb past the stoplist.
     run = Canon(9, "sym", "_run", (("src/x.py", "_run"),), "def _run(cmd):", _norm_text("x"), 2, "python")
     assert reference_canons("sym", "src/a.py", "go", "_run(['ls'])", [run]) == []