Static blog site generator in one Go binary: Markdown in, self-contained semantic HTML out. No JavaScript, no database, minimal deps.

CLI: -help lists every flag of every subcommand #32

Merged janantos.tngl.sh
targeting main from create-toc
Merged opened by and assigned to janantos.tngl.sh
targeting main from create-toc

The top-level help now ends with an 'all flags' section: for each of build/serve/create/createsite/validate, the full flag list with descriptions and defaults — generated from the real FlagSets via fs.Usage() on a captured buffer, so the help can never drift from what the commands actually accept. The flag definitions moved into shared constructors (buildFlags, serveFlags, ...) used by both the handlers and usage(). The site-layout line now also lists the toc and type frontmatter fields. TestUsageListsAllFlags guards the output.

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