feat(mma): Add mma.ps1 helper script for manual triggering

scripts/mma.ps1

@@ -0,0 +1,25 @@
+param(
+    [Parameter(Mandatory=$true, Position=0)]
+    [ValidateSet("tier1", "tier2", "tier3", "tier4", "orchestrator", "tech-lead", "worker", "qa")]
+    [string]$Role,
+
+    [Parameter(Mandatory=$true, Position=1)]
+    [string]$Prompt
+)
+
+# Map human-readable aliases to mma_exec roles
+$RoleMap = @{
+    "orchestrator" = "tier1-orchestrator"
+    "tier1"        = "tier1-orchestrator"
+    "tech-lead"    = "tier2-tech-lead"
+    "tier2"        = "tier2-tech-lead"
+    "worker"       = "tier3-worker"
+    "tier3"        = "tier3-worker"
+    "qa"           = "tier4-qa"
+    "tier4"        = "tier4-qa"
+}
+
+$MappedRole = $RoleMap[$Role.ToLower()]
+
+Write-Host "[MMA] Spawning Role: $MappedRole" -ForegroundColor Cyan
+uv run python scripts/mma_exec.py --role $MappedRole $Prompt