feat(build): automatically detect WIT world for TinyGo builds #58

[brooksmtownsend]

Summary

This PR implements automatic WIT world detection for TinyGo builds when wit_world is not explicitly configured, addressing the feature request in #58.

Changes

• ✅ Automatic World Detection: When wit_world is not specified in the TinyGo build configuration, the system now automatically scans the WIT directory for available worlds
• ✅ Smart Behavior:
  • If exactly one world is found → automatically uses it and logs the detection
  • If multiple worlds are found → lists all available worlds in the error message for user selection
  • If no worlds are found → maintains the existing placeholder behavior
• ✅ Enhanced Error Messages: Improved error messages that show discovered worlds when multiple exist
• ✅ Comprehensive Tests: Added 5 test cases covering all scenarios (single world, multiple worlds, no worlds, multiple files, missing directory)

Behavior Examples

Before (always required manual configuration):

wash build
# Error: TinyGo builds require wit_world to be specified in the configuration...

After (automatic detection for single-world projects):

wash build  
# ✅ Info: automatically detected WIT world: my-world
# ✅ Success: builds without requiring configuration

Multiple worlds scenario:

wash build
# Error: Multiple worlds found: world-one, world-two. Please update the wit_world field...

Test Plan

• Added unit tests for detect_wit_worlds function covering all scenarios
• Tests handle single world, multiple worlds, no worlds, multiple files, and missing directories
• Manual verification of WIT parsing logic using sample WIT files
• Verified error messages include helpful world listings

Breaking Changes

None - this is a backward-compatible enhancement that maintains existing behavior when wit_world is explicitly configured.

Fixes #58

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