[gmh5225]

Add reproducible feature data for NeverSight/NeverD#495: 59 rules in five concrete libc++, MSVC STL, ATL string, ATL COM and musl profiles. Each pack retains the actual compiler/source identities, header hashes, compiled witnesses and explicit identity requirements. Structural similarity alone cannot name a C++ library, and probe wrappers never become library callees.

The finite contracts cover typed accessor expressions, five COM ownership policies and gated whole-function patterns produced by the existing NeverD signature generator. Inherited CStringT/CComPtr methods retain their actual base-class identities. The musl pack also publishes five compatible .pat entries; the existing 16-byte admission floor stays intact.

Validation:

• 28 focused producer/contract tests pass locally; all five packs and archived evidence validate.
• Independent libc++ builds reproduce 9 object/assembly/IR artifacts; MSVC builds reproduce 14 objects/assembly files; musl builds reproduce 9 objects/images/pattern artifacts.
• Windows producer/reproduction CI passed on 0342b89, run 37279834318. Linux CI runs the full collector suite and feature validator.
• The recorded NeverD build cf8cfa408 matches musl 5/5 with ELF symbol boundaries and 4/5 stripped, with zero wrong names. Its missing stripped memcpy candidate is retained for integration regression coverage. This limitation is separate from pattern validity.
• Digest-addressed files preserve their bytes across Git line-ending settings. macOS cannot run seven existing collector tests that require GNU/Linux archive and demangling tools; the complete collector suite runs on Ubuntu CI.

This is the data phase. consumer_verified remains false: shared MedIR recognition, identity precedence, HighC/LLVMC projection, region boundaries and reversible folding are the subsequent NeverD implementation. This PR does not close the issue.