Define v0 semantic context projection schema

[yvlachak]

Summary

Defines an exploratory v0 schema for source-anchored semantic context projection in Zero.

This PR adds a short design document and one concrete JSON fixture grounded in the existing TYP009 / make-binding-mutable repair path.

Motivation

Zero already exposes structured diagnostics, explain output, repair metadata, fix-plan JSON, graph JSON, command contracts, and conformance fixtures.

This PR explores how those existing surfaces could feed a small semantic context projection artifact: a source-anchored repair-memory node that preserves the relationship between a diagnostic, a repair, an edit preview, and human-readable rationale.

The goal is not to implement a full semantic memory system yet. The goal is to define a minimal reviewable contract that future commands or sidecar storage could build on.

Changes

• Adds docs/design/semantic-context.md
• Adds conformance/context/repair-memory-typ009.projection.json

The fixture models a v0 repair-memory node containing:

• schemaVersion
• kind
• nodeId
• sourceAnchor
• string codes
• diagnosticCode
• repairId
• residualSummary
• parents
• a small context-projection frontier

Scope

This is intentionally schema/design-only.

Validation

Passed locally:

• fixture JSON parse check
• git diff --check
• npm run command-contracts:local
• npm run conformance:local

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