docs(6209): snippets, rule embeddings, notes, ledger ageing and references, routes, reporting, handshake, lesson kind, request deadlines, contract-around-change, family models

Twelve more test files drop issue, milestone, rule, note, lesson and
snippet numbers and the dated or one-project figures that recorded how
each property was found; the docstrings state the property and why it
holds. The contract-around-the-change guard keeps the dict-key example as
the failure a signature-watcher misses.

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

tests/test_services_snippets.py

@@ -3,7 +3,7 @@ from scribe.services import snippets as s
 
 
 def test_the_embedded_title_joins_the_trigger_the_stored_one_does_not_carry():
-    """Milestone 427: stored title = name; the trigger joins it at embed time,
+    """Stored title = name; the trigger joins it at embed time,
     idempotently, so an old composed title comes out the same."""
     from scribe.services.embeddings import document_title
 
@@ -167,7 +167,7 @@ def test_merge_snippet_fields_unions_locations_and_tags():
     # extra tags unioned, language + "snippet" markers excluded.
     assert extra == ["core", "helper"]
 
-    # Attribution (#2165): only what each source ACTUALLY added. src2's location
+    # Attribution: only what each source ACTUALLY added. src2's location
     # is one the target already had, so it contributed nothing — un-merging it
     # must not strip a call site the survivor owns in its own right.
     assert contributions[0]["locations"] == [{"repo": "b", "path": "b.py", "symbol": "g"}]
@@ -249,7 +249,7 @@ def test_data_and_body_round_trip_to_the_same_fields():
     name, when, sig, lang = ("debounce", "rate-limit a callback",
                              "debounce(fn, ms)", "ts")
     locs = [{"repo": "web", "path": "src/util.ts", "symbol": "debounce"}]
-    # compose_body takes no `name` — the name IS the title (milestone 427) — so
+    # compose_body takes no `name` — the name IS the title — so
     # the two serializers get their own argument lists rather than a shared spread.
     title = name
     body = s.compose_body(code="const x = 1", language=lang, signature=sig,
@@ -267,7 +267,7 @@ def test_data_and_body_round_trip_to_the_same_fields():
         assert from_body[key] == from_data[key], key
 
 
-# --- merge provenance (#2087) ------------------------------------------------
+# --- merge provenance -------------------------------------------------------
 
 def test_normalize_merged_from_keeps_history_order_and_drops_junk():
     """Order is history, not sorting — earlier merges stay first."""
@@ -276,7 +276,7 @@ def test_normalize_merged_from_keeps_history_order_and_drops_junk():
 
 
 def test_normalize_merged_from_carries_per_source_attribution():
-    """The shape that makes un-merge exact (#2165): each entry holds what THAT
+    """The shape that makes un-merge exact: each entry holds what THAT
     source contributed, so reversing one can't strip what the survivor owns."""
     loc = {"repo": "a", "path": "a.py", "symbol": "f"}
     out = s._normalize_merged_from([{"id": 7, "locations": [loc], "tags": ["x"]}])