feat(1e): HC3 additive generic + op/assertion split (orchestrator owns the op)

- orchestrator: per mutating tier, run optional pre-op seed hook (ops.py pre_<op>) → perform the op
  ONCE (harness-owned) → run generic assertion (unless opted out) AND overlay assertion, both against
  the shared post-op deployment. Op results passed op→assertion via run-scoped CCCI_OP_STATE_FILE.
- opt-out: CCCI_SKIP_GENERIC / CCCI_SKIP_GENERIC_<OP> / recipe_meta.SKIP_GENERIC (declarative).
- generic.py: split do_* into op primitives (perform_upgrade/backup/restore) + assertions
  (assert_upgraded/backup_artifact/restore_healthy) reading op_state(); deployed_identity now returns
  {version,image,chaos} (chaos label ready for HC1).
- generic test_<op>.py + all 6 recipe overlays migrated to assertion-only; pre-op seeding moved to
  per-recipe ops.py (pre_upgrade/pre_backup/pre_restore). install overlays unchanged (no op).
- deploy-count stays 1 (op primitives never call deploy_app). lint PASS; 8 unit tests PASS on cc-ci.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/_generic/test_restore.py

@@ -1,8 +1,9 @@
-"""Generic RESTORE tier (Phase 1d DG3) — recipe-agnostic, backup-capable recipes only.
+"""Generic RESTORE tier (Phase 1d DG3 + Phase 1e HC3) — recipe-agnostic, assertion-only.
 
-Restores the latest snapshot (produced by the backup tier on the same shared deployment) and asserts
-the restore completes and the app is healthy + serving afterwards. App-specific data-integrity
-(marker survives) is a recipe overlay (test_restore.py); the generic verifies the restore mechanism."""
+The orchestrator restored the latest snapshot ONCE (produced by the backup op on the same shared
+deployment). This tier ASSERTS the restore completed and the app is healthy + serving afterwards — it
+does NOT perform the op. App-specific data-integrity (marker survives) is a recipe overlay
+(test_restore.py); the generic verifies the restore mechanism. Runs by default ALONGSIDE any overlay."""
 
 import os
 import sys
@@ -12,4 +13,4 @@ from harness import generic  # noqa: E402
 
 
 def test_restore_healthy(live_app, meta):
-    generic.do_restore(live_app, meta)
+    generic.assert_restore_healthy(live_app, meta)