feat: central RTC write modes (DISABLED/DRY_RUN/APPROVAL/ENABLED), R4 suggestion-only, preview/approval, per-record rollback, bulk blocker upsert; 1.2.0

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

release/RELEASE_MANIFEST.json

@@ -1,14 +1,14 @@
 {
  "artifact": "RELEASE_MANIFEST",
- "GTI_FISCAL_VERSION": "1.1.9",
+ "GTI_FISCAL_VERSION": "1.2.0",
  "generated_at": "2026-09-24T14:13:15+00:00",
  "hub": {
-  "version": "1.1.9",
+  "version": "1.2.0",
   "api_compat": "1.0",
   "engine_version": "0.3.0",
   "decision_version": "mission-04c-ipi-ex-split"
  },
- "agent_version": "1.1.9",
+ "agent_version": "1.2.0",
  "fiscal_engine": {
   "ENGINE_VERSION": "0.3.0",
   "DECISION_VERSION": "mission-04c-ipi-ex-split",
@@ -17,10 +17,10 @@
   "ICMS_CONTEXT_ENGINE_VERSION": "icms-context-v1"
  },
  "migrations": {
-  "alembic_head_in_repo": "0027_rtc_auto_apply",
-  "applied_revision": "0027_rtc_auto_apply",
+  "alembic_head_in_repo": "0028_rtc_write_modes",
+  "applied_revision": "0028_rtc_write_modes",
   "applied_revision_source": "production Hub 10.0.10.117 (gti-fiscal-hub-fiscal-hub-1), verified 2026-09-24",
-  "count": 27
+  "count": 28
  },
  "datasets_active": [
   {

release/VERSION

@@ -1 +1 @@
-1.1.9
+1.2.0