Support CentrMark (.cmk) in Pandoc

[AMDphreak]

Title: Support CentrMark (.cmk) in Pandoc (custom reader + native inclusion request)

Hi Pandoc team,

I’m requesting support for CentrMark (.cmk), a declarative markup format designed for technical writing and developer documentation. CentrMark keeps the “90% Markdown” feel while adding a uniform directive system (void directives like ::toc, block directives like :::: tabs ... ::::, and inline directives like @badge[color=...](text)).

Repo/spec:

• Specification/docs: https://github.com/dev-centr/centrmark
• Key grammar reference: https://github.com/dev-centr/centrmark/blob/main/spec/formal_grammar.ebnf
• Example document: https://github.com/dev-centr/centrmark/blob/main/examples/showcase.cmk

What I’m asking for:

1. Add an initial custom reader for CentrMark (so users can run: pandoc -f cmk -t html), ideally via Pandoc’s supported custom reader mechanism.
2. If possible, discuss a path to eventual native inclusion in Pandoc core.

Why custom reader first:

• It lets the ecosystem integrate immediately while parsing/AST semantics are iterated.
• It provides a stable on-ramp for downstream toolchains.

Thanks!