mir-backend-beam

Make It Right (BEAM runtime tier). Erlang VM / BEAM reliability footguns shared across every BEAM-based backend (Phoenix, Nerves, pure Erlang) — distinct from the generic backend gates and from any one framework's mechanics. Covers: let-it-crash + supervision tree design (restart strategies, poison-message crash-loops), unbounded mailbox growth and backpressure (GenStage/Broadway/synchronous call), hot GenServer as a serial bottleneck and when to use ETS instead, blocking handle_call timing out callers and queuing all others, isolated per-process heap and how to share state (messages / ETS / persistent_term), and distributed Erlang hazards (netsplits, :global name clashes, pairwise ordering). TRIGGER when the backend runtime is Elixir or Erlang — sits between mir-backend (generic) and the framework module (e.g. mir-backend-beam-phoenix). SKIP for Python, Node, Go, JVM, Rust, .NET, Ruby, PHP runtimes (each has its own mir-backend-<runtime> tier), and for framework-library mechanics (those live in the framework module).