Revert "feat(ecc): prune plugin 43→12 items, promote 7 rules to .claude/rules/ (#245)"

This reverts commit 1bd68ff534.

.cursor/rules/golang-hooks.md

@@ -0,0 +1,17 @@
+---
+description: "Go hooks: gofmt/goimports auto-format, go vet, staticcheck"
+globs: ["**/*.go"]
+alwaysApply: false
+---
+
+# Go Hooks
+
+> This file extends [common/hooks.md](../common/hooks.md) with Go specific content.
+
+## PostToolUse Hooks
+
+Configure in `~/.claude/settings.json`:
+
+- **gofmt/goimports**: Auto-format `.go` files after edit
+- **go vet**: Run static analysis after editing `.go` files
+- **staticcheck**: Run extended static checks on modified packages