MCP clients (e.g. Claude Code) may serialize number parameters as JSON
strings instead of JSON numbers. The Go type assertion .(float64) silently
returns 0 for string values, causing "issue does not exist [index: 0]"
errors.
Add to.Float64() helper that handles float64, int, int64, and string types
via strconv.ParseFloat. Replace all 62 bare .(float64) assertions across
9 operation files with to.Float64() calls.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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