Split mldoc library, CLI, JS and benchmark opam packages

[RCmerci]

Installing mldoc currently pulls benchmark, JavaScript and native CLI dependencies even for OCaml library consumers. Keep the existing library/API in mldoc and give each tool its own package and installation target. Parser, exporter, CLI and benchmark implementation source is unchanged.

All four packages directly require OCaml >= 4.14.0 and Dune >= 3.5.

Package	Purpose / other direct dependencies
mldoc	Existing library: angstrom = dev, xmlm = dev, bigstringaf, ppx_deriving_yojson, uri, yojson. alcotest, qcheck, qcheck-alcotest are with-test; odoc is with-doc.
mldoc-cli	Installs the existing native mldoc command: same-version mldoc, cmdliner >= 1.1.0, lwt.
mldoc-js	Installs the existing JS export as share/mldoc-js/index.js: same-version mldoc, js_of_ocaml >= 5.2.0, build-only js_of_ocaml-ppx.
mldoc-bench	Installs benchmark/timing tools and example inputs: same-version mldoc, core, core_bench, core_unix; unavailable on win32.

Make defaults to the core library, with separate cli/js/bench targets and an explicit all target. npm publication builds only JS. CI checks installed packages separately for OCaml 4.14.x and 5.3.x. Existing library/export modules remain together.

Pin Angstrom to 3be9b966dc2bc9ccf9948d17a7b0df1cb526de15: the parser uses its exposed lookahead API and continuation behavior. Retain Xmlm eb469d536e98c98f2754c0ff8813c92b3a17fe9f to preserve OPML XML attribute newlines.

Validation on macOS, OCaml 5.5.0 / Dune 3.23.1:

• Four independent package builds, actual opam installation of generated manifests, and installed-artifact smoke checks passed (external OCaml consumer, CLI file/stdin/errors, JS Node/browser context, synthetic benchmark fixtures).
• All 6 existing regression suites passed: 271 tests, including both OPML newline cases.
• All four opam files pass lint; shell/JS syntax, CI YAML and diff checks pass.
• A private opam root reused compiled compiler/dependency artifacts under their original dependency constraints. opam install --assume-built consumed already-verified package builds to avoid repeating them. In that version snapshot the core's default dependency closure falls from 114 to 19, excluding compiler packages and mldoc itself.

Remote validation for head 4d623ba6128d199e1dd115d47903f3d16b463c18: CI completed successfully for all eight Linux jobs (OCaml 4.14.x / 5.3.x × four packages), including installed-artifact smoke checks and core regressions/docs. Format also passed. These versions were not run locally; Windows remains untested.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-14T14:58:37.238011Z	4d623ba	PR opened

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