Migrate bundled fallback fonts off runtime parsing

[Happypig375]

Parent: #191

Complete the runtime migration for AMS and Cyrillic fallback faces and remove raw bundled-font parsing/resources from the normal package path.

Acceptance criteria

• generated AMS override and Cyrillic supplement preserve exact fallback order and glyph identities
• all bundled rendering paths use generated records; normal startup parser count remains zero
• raw OTF files remain repository generation inputs but are no longer embedded runtime resources
• custom LocalTypefaces still load/render through Typography without behavior or ownership changes
• all parser/layout tests and unchanged Skia/Avalonia golden trees pass, including fallback, variants, assemblies, accents, and mixed text/math
• schema/source-hash mismatch failures are deterministic and actionable