Add generic BRF printer

[ip332]

Summary

• Add human-readable inspection for arbitrary validated BRF records without generated code.
• Implement the printer exclusively as a consumer of quarry_brf_traverse().
• Stream output through a caller-provided callback with caller-owned bounded workspace and output limits.
• Support reflective names with minimal-QBS numeric fallback, scalar values, strings/escaping, bytes, numeric enums, arrays, nested records, and record arrays.
• Keep the output deterministic and diagnostic-oriented; it is not a serialization format.

Compatibility

• QBS and BRF formats unchanged.
• Generated-code epochs unchanged: C++ 3, C 2, Python 1.
• No heap allocation or native recursive BRF walker.

Validation

• Full CTest: 52/52 passed
• Focused generic C printer tests passed, including writer failure, output limits, deterministic output, and nested formatting
• Strict C99 build passed
• Traversal, encoding, decoding, packaging, and interoperability tests passed