# PBS ⇄ VM Alignment — Junie PRs (HIP Semantics Hardening)

> **Purpose:** fix semantic mismatches between the PBS frontend (Core IR) and the VM **before** any VM heap/gate implementation.
>
> These PRs are **surgical**, **mandatory**, and **non-creative**.
> Junie must follow them **exactly**.

> **Context:**
>
> * PBS frontend is implemented and produces Core IR.
> * Bytecode stability is a hard requirement.
> * VM currently has stack + const pool; heap exists but is unused.
> * HIP semantics (gates/storage) are currently **incorrectly lowered**.
> * `ir_vm` is feature-frozen at the moment. we are going to validate only `ir_core`
> * Lowering is the only place `ir_core` and `ir_vm` touch each other.
    >    - VM IR is never imported from Core IR.
>    - Core IR never imports VM IR.

---

## Global Rules (Read Before Any PR)

1. **No new features.** Only semantic correction.
2. **No new VM opcodes yet.** VM changes come later.
3. **No fallback values** (e.g. `FunctionId(0)`). Fail with diagnostics.
4. **Every PR must include tests** (golden or unit).
5. **Core IR is the source of semantic truth.**