Fix logger vet format warnings

[besendorf]

Summary

Fix Go vet failures in the logger and logging call sites so go test ./... passes on main.

The root cause was a mix of print-style logger wrappers forwarding variadic arguments through a printf-like helper with an empty format string, plus a few logging calls using %w or an incomplete % directive in non-wrapping log output.

Changes

• Pass print-style logger arguments through fmt.Sprint with an explicit %s format.
• Replace logging-only %w directives with %v.
• Fix one malformed log format string in modules/logs.go.

Validation

• make collector
• go test ./...