Prove complete bundled-font record parity and representation equivalence

[Happypig375]

Parent: #320
Blocked by the MATH-record extraction child.

Complete logical-artifact parity and representation validation before runtime migration.

Acceptance criteria:

• regenerate complete logical artifacts for all three bundled faces
• prove binary and generated-C# models are logically identical
• verify every source hash, section count/offset, glyph mapping, outline, metric, and MATH record
• record binary/C# sizes plus build implications using Benchmark math-font startup allocations and retained memory #293 methodology
• CI regenerates and byte-compares the complete artifact set
• document the final unused-data inventory and migration contract for Render Latin Modern from generated font data #321
• production rendering remains unchanged