feat: add experimental selected-map event catalog

[jasoncavinder]

Summary

• add an experimental, read-only selected-map event catalog to the core library
• add tilewright events <PATH> <MAP_ID> with deterministic human and versioned
  JSON output
• expose only map-scoped event IDs, decoded names, coordinates, and opaque page
  counts while preserving page bodies, commands, notes, and unknown fields
• record the evidence contract and accepted ADR 0011

Evidence and impact

The bounded shape audit covers 1,555 events across 196 RPG Maker MZ 1.10.0 map
documents. An independent comparison matched all 10,323 projected fields and
CLI-envelope values. This remains Experimental and does not claim event-command
understanding, mutation, persistence, or general editor compatibility.

Verification

• generated synthetic positive, negative, boundary, preservation, and CLI tests
• independent four-project differential audit
• complete Rust workspace quality gate passed locally
• git diff --check passed