## Global Rules (Binding)

1. **No semantic leakage**

    * `ir_vm` must not encode PBS semantics (no `when`, `optional`, `result`, etc.).
    * `ir_core` must not encode VM execution details (no stack slots, no offsets-as-pointers).

2. **Feature freeze discipline**

    * `ir_vm` is treated as a *stable ISA*.
    * Any change to `ir_vm` requires an explicit PR and review.

3. **No placeholders**

    * No `LoadRef(0)`, no `Nop` as semantic stand-ins.
    * If something cannot be represented, the PR must stop and report it.

4. **No creativity**

    * Implement exactly what is specified.
    * Do not add sugar, shortcuts, or inferred behavior.

5. **Tests are mandatory**

    * Every PR must include tests validating the new surface.

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