Correction: reject lost numbers and growth; place verifier anchors from the talkgroup name (server-26#162, server-26#160)

transcript_correction now also discards a correction that drops or changes a
bare number the recogniser heard (the live "7" -> "ShotSpotter" case) or
grows the transcript past max(4 words, 25%). place_verifier.verify() derives
an anchor from the talkgroup's own name plus the receiving node's state when
no area is configured; no state means no anchor, and a configured place
without an anchor keeps the load-bearing skip.

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

drb-c2-core/tests/test_transcript_correction.py

@@ -260,7 +260,10 @@ async def test_segment_code_change_discards_segments_only():
         "segments": ["Headquarters, 10-13.", "Show it out to Ossining.", "360 north, back to Route 9."],
     }
     with _system(), _gemini(payload):
-        text, segs, _ = await tc.correct("c1", "x y z w", SEGS, system_id="sys-1", talkgroup_id=9048)
+        # A realistic joined original (code-free, like the correction): a
+        # placeholder like "x y z w" now trips the server-26#162 growth guard.
+        text, segs, _ = await tc.correct("c1", "Shout out to Optum, back to Rose.", SEGS,
+                                         system_id="sys-1", talkgroup_id=9048)
     assert segs is None
     assert text == "Show it out to Ossining, back to Route 9."
 
@@ -279,3 +282,30 @@ async def test_reference_data_reaches_the_prompt():
     assert "Sing Sing — state prison" in p, "a term without its meaning is half the information"
     assert "Ossining, Westchester, New York" in p, "state must reach the prompt (server-26#36)"
     assert "10-13=officer needs assistance" in p
+
+
+# ── server-26#162, the rest: bare numbers and invented words ────────────────
+
+@pytest.mark.asyncio
+async def test_a_bare_number_turned_into_a_word_is_rejected():
+    """The live case: a bare "7" came back as "ShotSpotter"."""
+    payload = {"corrected": "Car ShotSpotter on Home Street and Forest Ave."}
+    with _system(), _gemini(payload):
+        text, _, _ = await tc.correct("c1", "Car 7 on Holmes Street and 4th and Rowe.", None, system_id="sys-1")
+    assert text is None
+
+
+@pytest.mark.asyncio
+async def test_a_place_fix_that_keeps_its_numbers_still_passes():
+    payload = {"corrected": "Car 7 on Home Street and Forest Ave."}
+    with _system(), _gemini(payload):
+        text, _, _ = await tc.correct("c1", "Car 7 on Holmes Street and 4th and Rowe.", None, system_id="sys-1")
+    assert text == "Car 7 on Home Street and Forest Ave."
+
+
+@pytest.mark.asyncio
+async def test_a_correction_that_writes_new_sentences_is_rejected():
+    payload = {"corrected": "Car 7 on Main Street. Suspect is armed and fled northbound in a red sedan."}
+    with _system(), _gemini(payload):
+        text, _, _ = await tc.correct("c1", "Car 7 on Mane Street.", None, system_id="sys-1")
+    assert text is None