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docs(spec): add four-layer intro paragraph per PRESERVATION-DESIGN §12.6 #261

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docs(spec): add four-layer intro paragraph per PRESERVATION-DESIGN §12.6 #261

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2 changes: 2 additions & 0 deletions spec/SPEC.md
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Ephapax (from Greek ἐφάπαξ, "once for all") is a programming language with a linear type system designed for safe memory management targeting WebAssembly.

Ephapax's type system has four orthogonal disciplines: **L1** region capabilities, **L2** structural modality (linear/affine), **L3** irreversibility residue (Echo Types — planned), and **L4** dyadic interaction mode (project-level declaration). This specification is normative for L1 and L2 and forward-looking for L3 and L4. See [`docs/vision/EPHAPAX-VISION.adoc`](../docs/vision/EPHAPAX-VISION.adoc) for the dyad framing and [`formal/PRESERVATION-DESIGN.md`](../formal/PRESERVATION-DESIGN.md) for the per-layer design.

### 1.2 Design Goals

1. **Memory Safety**: Prevent use-after-free, double-free, and memory leaks
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2 changes: 2 additions & 0 deletions spec/ephapax-spec.md
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The dyadic principle: both disciplines coexist at per-binding granularity.

Ephapax's type system has four orthogonal disciplines: **L1** region capabilities, **L2** structural modality (linear/affine), **L3** irreversibility residue (Echo Types — planned), and **L4** dyadic interaction mode (project-level declaration). This specification is normative for L1 and L2 and forward-looking for L3 and L4. See [`docs/vision/EPHAPAX-VISION.adoc`](../docs/vision/EPHAPAX-VISION.adoc) for the dyad framing and [`formal/PRESERVATION-DESIGN.md`](../formal/PRESERVATION-DESIGN.md) for the per-layer design.

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# PART 1: LEXICAL GRAMMAR
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