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# 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.