verify(P15): run-platform-help-and-flags-doc — 4-layer verify PASS + ship

VERIFY: structural — --help + documented flags; behavioral --help exits 0 + CI PASS; quality — README surfaces --local + --help.

---ci---
project: acdl
phase: 15
milestone: v1.16
status: complete
phase_role: execution
requirements:
  covered: [REQ-179]
  partial: []
---/ci---

README.md

@@ -183,9 +183,17 @@ python3 -m pytest tests/ -v
 bash scripts/run_platform.sh --check-only
 # Expected: "=== PLATFORM CHECK OK ==="
 
+# Run the headline E2E against the local emulating tier (no AWS credentials
+# needed — emulates ECS, outbox, S3 state, Lambda in-process; D-092).
+bash scripts/run_platform.sh --local
+# Expected: "=== LOCAL E2E OK ==="
+
 # Reproduce the full CI pipeline locally (lint -> test -> check-only)
 bash scripts/run_ci.sh
 # Expected: "=== CI PIPELINE OK ==="
+
+# Show all run_platform.sh flags + a one-line description each.
+bash scripts/run_platform.sh --help
 ```
 
 ### CI/CD pipelines