Add points/vector-loading ADRs and status plans

[xinaesthete]

Harvested from the larger points-loading branch. Design records only — no code — so safe to land ahead of the implementation.

• ADR 0002 — Spatially-aware vector loading (Morton Parquet artifacts, bounded loading API, experimental optimization collections, feature/gene filtering, GeoParquet vs GeoArrow boundary).
• ADR 0003 — Points render resource (render-time boundary between store I/O, resolver, and the deck.gl PointsLayer; encoding selection; batch contract; FBO render-caching as future work).
• docs/plans/* — WIP status notes for the points preload + feature filter work and parquet I/O error handling.

These live outside docs/docs/ so they are not part of the published docs site. browser-workers.mdx was intentionally left out — it documents worker APIs that aren't on main yet.

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📥 Commits

Reviewing files that changed from the base of the PR and between f973983 and 52489b9.

📒 Files selected for processing (4)

• docs/adr/0002-spatially-aware-vector-loading.md
• docs/adr/0003-points-render-resource.md
• docs/plans/parquet-io-error-handling.md
• docs/plans/points-preload-feature-filter-status.md

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• Create PR with unit tests
• Commit unit tests in branch harvest/points-design-docs

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