chore: unify HA manufacturer and add refactor guards

test/check_ha_manufacturer.ps1

@@ -0,0 +1,37 @@
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+$repoRoot = (Resolve-Path (Join-Path $PSScriptRoot "..")).ProviderPath
+$configPath = (Resolve-Path (Join-Path $repoRoot "include/config.h")).ProviderPath
+$mqttPath = (Resolve-Path (Join-Path $repoRoot "src/mqtt_client.cpp")).ProviderPath
+
+$configText = Get-Content -Raw -Path $configPath
+if ($configText -notmatch 'HA_MANUFACTURER\[\]\s*=\s*"AcidBurns"\s*;') {
+  throw "include/config.h must define HA_MANUFACTURER as exactly ""AcidBurns""."
+}
+
+$mqttText = Get-Content -Raw -Path $mqttPath
+if ($mqttText -notmatch 'device\["manufacturer"\]\s*=\s*HA_MANUFACTURER\s*;') {
+  throw "src/mqtt_client.cpp must assign device[""manufacturer""] from HA_MANUFACTURER."
+}
+if ($mqttText -match 'device\["manufacturer"\]\s*=\s*"[^"]+"\s*;') {
+  throw "src/mqtt_client.cpp must not hardcode manufacturer string literals."
+}
+
+$roots = @(
+  Join-Path $repoRoot "src"
+  Join-Path $repoRoot "include"
+)
+
+$literalHits = Get-ChildItem -Path $roots -Recurse -File -Include *.c,*.cc,*.cpp,*.h,*.hpp |
+  Select-String -Pattern '"AcidBurns"' |
+  Where-Object { (Resolve-Path $_.Path).ProviderPath -ne $configPath }
+
+if ($literalHits) {
+  $details = $literalHits | ForEach-Object {
+    "$($_.Path):$($_.LineNumber)"
+  }
+  throw "Unexpected hardcoded ""AcidBurns"" literal(s) outside include/config.h:`n$($details -join "`n")"
+}
+
+Write-Host "HA manufacturer drift check passed."