feat(ledger): divergence readout — button B where button A is canon, shape history, and judged-shape recheck (#2793, milestone 294 step 7)

Every judgment now goes through one helper that remembers the fingerprint
judged (classified_sha) and writes a code_shape_events row; the sync writes
vanished / reappeared / drifted events and flags recheck_at when a body
moves under an instance/variant. The refresh flags diverges_from on shapes
new since the previous computation that sit where one canon dominates the
judged siblings of their directory+kind and were not proposed as that canon
(a first seed flags nothing); the write-path hint asks the same question
in-band for the shapes the hook names. list_shapes(flag=divergence|recheck),
shape_history(project_id, path, symbol) (read-only), coverage line/payload/
card carry divergent + recheck. Backup v8 carries the history. Plugin 0.1.36.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/test_services_backup.py

@@ -13,11 +13,12 @@ import pytest
 from scribe.services import backup
 
 
-def test_backup_version_is_v7():
-    """v7 added code_shapes (#2787). The bump is the point of the test —
-    a payload section added without moving the version produces backups that
-    are structurally different and indistinguishable by inspection."""
-    assert backup.BACKUP_VERSION == 7
+def test_backup_version_is_v8():
+    """v7 added code_shapes (#2787), v8 its history (#2793). The bump is the
+    point of the test — a payload section added without moving the version
+    produces backups that are structurally different and indistinguishable
+    by inspection."""
+    assert backup.BACKUP_VERSION == 8
 
 
 def test_not_included_lists_the_known_gaps():
@@ -114,7 +115,7 @@ async def test_export_full_backup_contains_every_declared_section():
                 "topic_suppressions",
                 "systems", "record_systems", "design_systems",
                 "design_tokens", "note_usage_events", "repo_bindings",
-                "note_supersessions", "code_shapes"):
+                "note_supersessions", "code_shapes", "code_shape_events"):
         assert key in out, f"missing export section: {key}"
         assert out[key] == []