refactor(level): four essential rungs only — integration & recipe-local are optional

Per operator: the level ladder is now the FOUR essential rungs every recipe is
held to — install, upgrade (essential), backup/restore, functional (top = L4).
Integration (SSO/OIDC) and recipe-local are OPTIONAL capabilities: they no longer
appear as level rungs or skip rows and never cap the level. SSO is still enforced
for the run VERDICT (unchanged in run_recipe_ci.py); it just doesn't affect the
level. derive_rungs simplified accordingly (drops declared/deps/sso/repo-local
inputs). custom-html-tiny's EXPECTED_NA is back to just backup_restore.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

runner/run_recipe_ci.py

@@ -1225,7 +1225,6 @@ def main() -> int:
     # a failure here NEVER changes `overall` (R7 — cosmetics never block the pipeline). ----
     data: dict | None = None
     try:
-        sso_unverified = sso_dep_unverified(declared, deps_ready, requires_deps_skipped)
         clean_teardown = (deploy_count == expected_deploy_count) and not dep_teardown_error
         data = results_mod.build_results(
             recipe=recipe,
@@ -1235,14 +1234,11 @@ def main() -> int:
             records=records,
             results=results,
             backup_capable=backup_cap,
-            declared=declared,
-            deps_ready=deps_ready,
-            sso_unverified=sso_unverified,
             clean_teardown=clean_teardown,
             no_secret_leak=True,  # narrowed below by an actual scan of the serialised artifact
             screenshot=screenshot_rel,  # Phase 3 U1 (R4): relative PNG name iff capture succeeded
             finished_ts=time.time(),
-            expected_na=meta.get("EXPECTED_NA"),  # declared intentional-N/A map (recipe_meta)
+            expected_na=meta.get("EXPECTED_NA"),  # declared intentional-skip map (recipe_meta)
         )
         # Real (if narrow) leak check: no known infra-secret value may appear in the artifact (R7).
         blob = json.dumps(data)