feat: gc export importer for ~1000x faster type resolution

- Add gc_export_importer.go: reads pre-compiled type data from Go build
  cache instead of parsing source, dramatically faster for large deps
- Type resolver now tries gcexportdata first, falls back to source importer
- Optional DINGO_PROFILE=1 env var for timing diagnostics
- Value enum formatting cleanup

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Release v0.13.0: Enhanced watch mode, VS Code debugging, LSP improvem…

…ents

v0.12.1 - Fix CLI progress display with mascot animation

v0.12.0 - dingo clean command

release: v0.11.6 - cross-package Result type detection fix

v0.10.0 - Shadow build system

v0.9.0 - dingo watch command and cross-file type resolution

v0.8.0 - unified build output paths

v0.5.1 - IIFE converter, version package, transpiler improvements

v0.7.0 - Code Navigation & Formatting

- Full LSP code navigation support for Dingo files
- Go-to-definition works across file boundaries
- Find all references for symbols
- Accurate position mapping for transformed code (error prop, tuples, etc.)

- New `dingo fmt` CLI command
- LSP textDocument/formatting support
- Format-on-save enabled by default in VS Code

- Rich hover for dgo.Result and dgo.Option types
- Hover support for error propagation expressions
- Lambda parameter type inference
- Enum variant documentation

- Accurate line mapping for tuple destructures (1→3 line expansion)
- Fixed off-by-one diagnostic line mapping
- Removed incorrect //line directive assumptions
- Better header offset calculation

- Debounced transpilation for responsive diagnostics
- Column mapping for precise cursor positioning
- Token-based region offset calculation