Aggregates __tessera_manifest__/0 across every tessera component in the
current Mix project and its loaded deps, then writes:
tessera-manifest.json— the tessera manifest (component list);custom-elements.json— the Custom Elements Manifest (Noizu.Tessera.Codegen.cem/1, schemaVersion "1.0.0").
Both files are written to the current project root. Run after mix compile
(the scanner reads compiled beams).
mix tessera.manifest