fz v1.7.2 – stable release with improved test coverage

• linker coverage: 43.3%
• updater coverage: 38.6%
• shell coverage: 40.6% (unit tests)
• All tests passing (no hangs)
• Fixed fallback test expectations
• Removed unstable shell integration test

Install: go install github.com/forgezero-cli/ForgeZero/cmd/fz@latest
Docs: https://github.com/forgezero-cli/ForgeZero