feat: add canonical schematic system maps

[duncanleo]

Summary

• add schematic map schemas, file-backed repository support, validation, CLI inspection, and Pages artifact indexing
• seed the canonical system map snapshots as reviewed SVG reference assets plus structured version metadata
• model each map version with station nodes keyed by station id, optional per-segment station ports, and straight/polyline/rounded/bezier route primitives instead of literal SVG path data
• add @mrtdown/schematic-map pure model, diagnostics, and debug SVG rendering utilities for downstream consumers
• generate schematic map manifests during Pages builds instead of storing source manifests, labels, or site provenance in data

Validation

• npm run data:validate
• npm run fixtures:validate
• npm run test:fs
• npm run test:cli
• npm run test:schematic-map
• npm run check
• npm run typecheck
• npm run pages:build

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/schematic-system-map-data

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