feat: gadfly-mcp — MCP server for grading gadfly-reports findings

Thin, stateless stdio MCP server (official Go SDK) that exposes a gadfly-reports store to an MCP client (e.g. Claude). Tools: list_findings, record_finding_grade, scoreboard (grader forced to claude). Launch via 'go run ...@latest' — nothing to install. Core logic tested against httptest, no daemon required.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

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-# ---> Go
-# If you prefer the allow list template instead of the deny list, see community template:
-# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
-#
-# Binaries for programs and plugins
-*.exe
-*.exe~
-*.dll
-*.so
-*.dylib
-
-# Test binary, built with `go test -c`
-*.test
-
-# Output of the go coverage tool, specifically when used with LiteIDE
-*.out
-
-# Dependency directories (remove the comment below to include it)
-# vendor/
-
-# Go workspace file
-go.work
-go.work.sum
-
-# env file
-.env
-
+# build output
+/gadfly-mcp