53 test cases covering 4 functions:
- gatherTags: environment/flag tag merging (18 cases)
- parseLogLevel: log level parsing (30 cases)
- defaultLogLevel: default value resolution (10 cases)
- multiValue: flag.Value interface for repeatable flags (6 cases)
Key difference from pulse-host-agent: parseLogLevel in unified agent delegates
directly to zerolog.ParseLevel without range validation, so trace/fatal/panic
levels are accepted (unlike pulse-host-agent which restricts to debug-error).
First test file for cmd/pulse-agent package.
