diff --git a/README.md b/README.md
index 2990cd4..4e81f21 100644
--- a/README.md
+++ b/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
diff --git a/scripts/run_platform.sh b/scripts/run_platform.sh
index ff31e25..fb13e28 100755
--- a/scripts/run_platform.sh
+++ b/scripts/run_platform.sh
@@ -7,6 +7,9 @@
 #   run_platform.sh --plan-only <contract.yml>  (AWS plan only, no Checkov/outbox)
 #   run_platform.sh --apply <contract.yml>     (AWS apply: init/validate/plan/apply)
 #   run_platform.sh --destroy <contract.yml>   (AWS destroy: init/validate/destroy)
+#   run_platform.sh --local [contract.yml]      (local emulating tier, no AWS)
+#   run_platform.sh --decommission <CR> <contract.yml> (gated teardown)
+#   run_platform.sh --help                      (show all flags)
 #
 # Modes:
 #   --check-only  (offline, no AWS/Checkov/DynamoDB — for CI)
@@ -17,13 +20,19 @@
 #     contract -> resolver -> stack -> adapter -> terraform init/validate/plan/apply -> exit 0
 #   --destroy     (requires AWS creds; use --decommission <CR> for gated production teardown)
 #     contract -> resolver -> stack -> adapter -> terraform init/validate/destroy -> exit 0
+#   --local       (no AWS creds; local emulating tier D-092)
+#     contract -> resolver -> adapter -> local S3/ECS/outbox/Lambda stubs -> exit 0
 #   (default)    (requires AWS creds + Checkov + DynamoDB)
 #     contract -> resolver -> stack -> adapter -> terraform plan -> Checkov ->
 #     confidence -> outbox
 #
 # Flags:
-#   --quiet   suppress terraform/checkov streaming (output to log only)
-#   --decommission  gate --destroy with D-070 two-step CR validation (requires <CR>)
+#   --quiet          suppress terraform/checkov streaming (output to log only)
+#   --decommission   gate --destroy with D-070 two-step CR validation (requires <CR>)
+#   --deploy-uptime  deploy the uptime monitoring stack (separate state)
+#   --local          run the headline E2E against the local emulating tier (D-092)
+#   --environment <name>  override the contract's environment at load time (D-088)
+#   --help, -h       show all flags + a one-line description
 #
 # The contract file is a YAML file validated against schemas/contract.schema.json.
 # The resolver (core/contract_resolver.py) resolves it to a Target Stack
@@ -59,6 +68,36 @@ CHANGE_REQUEST_ID=""
 ENVIRONMENT_OVERRIDE=""
 CONTRACT=""
 
+# P15 (REQ-179): --help / -h prints all flags + a one-line description.
+_print_help() {
+  cat <<'HELP'
+Nova platform pipeline — run_platform.sh
+
+Usage:
+  run_platform.sh <contract.yml>                      (full e2e with AWS)
+  run_platform.sh --check-only [contract.yml]         (offline, no AWS)
+  run_platform.sh --plan-only <contract.yml>          (AWS plan only)
+  run_platform.sh --apply <contract.yml>              (AWS apply)
+  run_platform.sh --destroy <contract.yml>            (AWS destroy)
+  run_platform.sh --local [contract.yml]              (local emulating tier)
+  run_platform.sh --decommission <CR> <contract.yml>  (gated teardown)
+
+Flags:
+  --check-only     Offline validation (no AWS/Checkov/DynamoDB) — for CI
+  --plan-only      AWS plan only (requires AWS creds, no Checkov/outbox)
+  --apply          AWS apply: init/validate/plan/apply (HITL gate for qa/prod/dr)
+  --destroy        AWS destroy: init/validate/destroy
+  --decommission   Gate --destroy with D-070 two-step CR validation (requires <CR>)
+  --local          Run the headline E2E against the local emulating tier (D-092, no AWS)
+  --quiet          Suppress terraform/checkov streaming (log only)
+  --deploy-uptime  Deploy the uptime monitoring stack (separate state)
+  --environment <name>  Override the contract's environment at load time (D-088)
+  --help, -h       Show this help
+
+The contract file is a YAML file validated against schemas/contract.schema.json.
+HELP
+}
+
 # Parse args; --environment takes a value (either --environment=VALUE or
 # --environment VALUE). The contract / changeRequestId are the remaining
 # positional args.
@@ -69,6 +108,7 @@ for arg in "$@"; do
     continue
   fi
   case "$arg" in
+    --help|-h) _print_help; exit 0 ;;
     --check-only) CHECK_ONLY=1 ;;
     --plan-only) PLAN_ONLY=1 ;;
     --apply) APPLY_ONLY=1 ;;