[codex] Add v0.3 converter evidence and sample workflows

[CrushOnAI]

Summary

• add three original SFW examples that can be loaded directly in the browser converter
• add a downloadable, versioned JSON conversion report
• publish human-readable and machine-readable compatibility matrices
• report mapped, approximated, skipped, and unsupported fields observed in each conversion
• correctly map SillyTavern constant: true entries to Always On
• bump the toolkit and converter version to 0.3.0

Why

The v0.2 interface showed diagnostics but did not provide a reusable report artifact or a machine-readable compatibility reference. It also listed constant as supported without applying it to trigger behavior. This release makes the evidence inspectable and gives first-time visitors safe examples that require no upload.

User impact

Visitors can try the converter immediately, download both the converted JSON and a versioned report, and review exactly which source fields were mapped, approximated, skipped, or unsupported.

Validation

• PYTHONPATH=src python3 -m unittest discover -s tests -v — 7 tests passed
• node spaces/world-card-converter/app.test.mjs — passed
• compatibility matrix JSON validation — passed
• local browser QA — all three samples visible; sample conversion passed; result and report controls enabled; no console errors or horizontal overflow
• git diff --check — passed
• privacy scan — no personal developer name, personal email, credentials, or real user data

Compatibility limits

The output remains a normalized structural fixture. The documentation does not claim lossless conversion, official native export, or universal third-party compatibility.