# PBS Specifications (Current)

This directory contains the current PBS specifications for frontend and language work.

## Authority model

- Runtime authority: `docs/specs/hardware/topics/chapter-2.md`, `chapter-3.md`, `chapter-9.md`, `chapter-12.md`, `chapter-16.md`.
- Bytecode authority: `docs/specs/bytecode/ISA_CORE.md`.
- Legacy reference only: `docs/specs/pbs_old/*`.

When a rule conflicts with runtime or bytecode authority, runtime and bytecode authority win.

## Purpose

- Define a stable syntax contract for PBS.
- Support a full frontend rewrite (lexer, parser, AST, lowering).
- Keep grammar deterministic and implementation-friendly.

## Files

- `PBS - Language Syntax Specification v0.md`: normative syntax and grammar for PBS v0 Core profile, including mandatory `mod.barrel` visibility rules.