feat(lane-g): wire validate-prophet-mesh-scope-mirror into make validate and CI

Adds validate-prophet-mesh-scope-mirror to the main validate target so
the prophet-mesh memory-scope mirror contract is gated on every validate
run, and adds a CI workflow that triggers on changes to the contract or
validator script.

Author: mdheller

.github/workflows/prophet-mesh-scope-mirror.yml

@@ -0,0 +1,24 @@
+name: prophet-mesh-scope-mirror
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+    paths:
+      - "contracts/prophet-mesh/**"
+      - "scripts/validate-prophet-mesh-scope-mirror.mjs"
+      - ".github/workflows/prophet-mesh-scope-mirror.yml"
+
+permissions:
+  contents: read
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+      - name: Validate prophet-mesh memory-scope mirror contract
+        run: node scripts/validate-prophet-mesh-scope-mirror.mjs

Makefile

@@ -1,6 +1,6 @@
 PYTHON ?= python
 
-.PHONY: validate-upstreams validate-python validate-deploy-assets validate-agent-learning-proposal validate-scenario-learning-binding validate-governed-learning-lifecycle validate-workspace-recall-promotion validate-channel-provenance-write-gate validate-wallguard-memory-compartment-gate validate local-preflight local-up local-smoke local-debug local-down
+.PHONY: validate-upstreams validate-python validate-deploy-assets validate-agent-learning-proposal validate-scenario-learning-binding validate-governed-learning-lifecycle validate-workspace-recall-promotion validate-channel-provenance-write-gate validate-wallguard-memory-compartment-gate validate-prophet-mesh-scope-mirror validate local-preflight local-up local-smoke local-debug local-down
 
 validate-upstreams:
 	$(PYTHON) scripts/validate_upstreams.py third_party/upstreams.lock.yaml
@@ -32,7 +32,7 @@ validate-channel-provenance-write-gate:
 validate-wallguard-memory-compartment-gate:
 	$(PYTHON) scripts/validate_wallguard_memory_compartment_gate.py
 
-validate: validate-upstreams validate-python validate-deploy-assets validate-wallguard-memory-compartment-gate
+validate: validate-upstreams validate-python validate-deploy-assets validate-wallguard-memory-compartment-gate validate-prophet-mesh-scope-mirror
 
 local-preflight:
 	bash deploy/local/scripts/preflight-podman-m2.sh