Prepare V1.0

Fixed

• smearing: Change variance_mean field to uint32_t and update tests
• cmp_tool: improve error handling—empty files now raise Error instead of Warning
• fuzz: fix file handling assertions
• docs: Correct doxygen generation issues

Added

• cmp_tool: Add samples and buffer length validation

Changed

• docs: Compression User Manual updated to Issue 1 Revision 1
• build: allow fuzz target builds if corpus download fails
• fuzz: redirect cmp_tool output to /dev/null