v1.1.1

Bugfixes:

• Live counter reads zero-extended the value returned by rdpmc instead of sign-extending it, so results could be off by 2^pmc_width (typically 2^48).
• HardwareInfo is now thread-safe: detected values are cached in function-local statics instead of unsynchronized static members.
• The sample decoder no longer reads past the end of truncated or corrupt records.
• Single-element braced lists like add({"cycles"}) or add_live({"cycles"}) did not compile because they were ambiguous between the std::string and std::vector overloads.