rename(547): three hook-shell tests call the renamed functions

The step-3 sweep matched `scribe` only after a non-letter, and in these
three tests the shell call sits right after a `\n` escape in a Python
string, so the character before it was the letter n. They still called
scribe_recent_context, scribe_skip_prompt and scribe_checkpoint_allowed;
they now call the grimoire_ names. No other escape-adjacent occurrence
remains in the tree.

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

tests/test_session_slippage_readout.py

@@ -317,7 +317,7 @@ def test_a_checkpoint_budget_is_restored_by_a_compaction(tmp_path):
     f = d / "s.checkpoint.ids"
     sh(f'grimoire_checkpoint_allowed "{f}" 156 >/dev/null')
     r = subprocess.run(
-        ["bash", "-c", f'. "{DEFS}"\nscribe_checkpoint_allowed "{f}" 156'],
+        ["bash", "-c", f'. "{DEFS}"\ngrimoire_checkpoint_allowed "{f}" 156'],
         capture_output=True, text=True, timeout=30,
     )
     assert r.returncode != 0, "a rule does not get to stop the same session twice"