Release v0.3 compatibility and query upgrades

[rittu-x]

What changed

• Add equivalent ESM and CommonJS package entry points.
• Add queryLocations with fuzzy search, bounding boxes, proximity/radius filtering, and pagination.
• Add query validation and correct unknown-zone behavior.
• Expand compatibility, JSON Schema, export, spatial, edge-case, and migration-sensitive tests.
• Add an API stability policy and prepare package metadata for v0.3.0.
• Correct the published v0.2.0 changelog date.

Why

This addresses the remaining developer-facing limitations identified after v0.2.0, while leaving coordinate completeness, coordinate confidence, and Dhivehi names for later work.

Developer impact

Existing ESM imports remain compatible. CommonJS consumers can now use require(), and applications can perform typo-tolerant and spatial queries without adding another library.

Validation

• npm run typecheck
• npm run check:generated
• npm test — 13/13 tests passed
• npm pack --dry-run --json — package manifest verified
• No geographic data changed