chore: align YAML dependencies with go-ftw

[Copilot]

goccy/go-yaml was previously removed (#28), but the repo still diverged from go-ftw's current yaml stack. This aligns the two.

Changes

• Switch to go.yaml.in/yaml/v4 in test files — matches the library go-ftw uses to parse FTW YAML files today
• Remove projectdiscovery/yamldoc-go — was never directly imported in Go source; go mod tidy correctly drops it. gopkg.in/yaml.v3 is retained as an indirect dep via transitive dependencies
• Remove broken doc-generation infrastructure — the generated files (test_doc.go, overrides_doc.go) were never committed, making the whole pipeline non-functional:
  • Drop //go:generate dstdocgen directives from types/types.go and types/overrides/types.go
  • Remove cmd/generate-doc-yaml-schema
  • Remove Generate() and Markdown() mage targets; Test() and Format() no longer depend on Generate()

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/coreruleset/go-ftw/contents/go.mod
  • Triggering command: /usr/bin/curl curl -s REDACTED 0.1-go1.25.7.lin-I conf�� 0.1-go1.25.7.lin--gdwarf-5 0.1-go1.25.7.lin--64 rg/toolchain@v0.-o pull.rebase (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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[fzipi]

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