refactor: migrate Markdown to AsciiDoc

ARCHITECTURE.adoc

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+== Architecture
+
+=== Overview
+
+This repository follows a modular, maintainable architecture designed
+for clarity, scalability, and long-term sustainability.
+
+=== Directory Structure
+
+....
+.
+├── src/           # Source code
+├── tests/        # Test suites
+├── docs/         # Documentation
+├── scripts/      # Utility scripts
+├── config/       # Configuration files
+├── LICENSE       # License file
+├── LICENSES/     # Full license texts
+└── README.adoc   # Project documentation
+....
+
+=== Design Principles
+
+* *Separation of Concerns*: Each module has a single responsibility
+* *Testability*: Code is written to be easily testable
+* *Documentation*: All public APIs are documented
+* *Configuration*: Environment-specific settings are externalized
+
+=== Dependencies
+
+* External dependencies are minimized and clearly declared
+* Version pinning is used for reproducibility
+
+=== Security Considerations
+
+* Sensitive data is never committed to the repository
+* Secrets are managed through environment variables or secure vaults
+* Regular dependency audits are performed
+
+=== Maintainability
+
+* Code follows consistent style guidelines
+* Pull requests require review and CI checks
+* Issues and discussions are tracked transparently
+
+'''''
+
+_Last updated: 2026-07-18_

CONTRIBUTING.adoc

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+== Contributing to julia-ecosystem
+
+Thanks for your interest. This repository follows the Hyperpolymath
+estate standards defined in
+https://github.com/hyperpolymath/standards[hyperpolymath/standards].
+
+=== Licence
+
+This project is licensed under *MPL-2.0*. By contributing you agree that
+your contributions are licensed under the same terms. Every source file
+carries an `+SPDX-License-Identifier+` header; keep it when editing, and
+add one to any new file.
+
+=== Development environment
+
+Use the toolchain declared by this repository (just).
+
+=== Build and test
+
+This repo uses https://just.systems[`+just+`] (the estate uses
+Justfiles, never Makefiles). Recipes available here:
+
+[source,sh]
+----
+just            # list recipes
+just doctor     # environment diagnostics
+----
+
+=== Machine-readable artefacts
+
+This repo carries `+.machine_readable/+` A2ML files (`+STATE.a2ml+`,
+`+META.a2ml+`, `+ECOSYSTEM.a2ml+`, `+AGENTIC.a2ml+`, `+NEUROSYM.a2ml+`,
+`+PLAYBOOK.a2ml+`). If your change alters project state, architecture,
+or operational steps, update the corresponding file in the same PR — CI
+validates them.
+
+=== Language policy
+
+The estate restricts which languages may be used. In particular Python,
+Go, TypeScript, ReScript, V-lang, Java/Kotlin, Swift and Makefiles are
+*not* accepted in new code; AffineScript, Rust/SPARK, Zig, Deno, Gleam,
+Elixir, Haskell, Idris2, Agda, Julia and OCaml are. CI enforces this, so
+check the policy in `+hyperpolymath/standards+` before introducing a new
+language.
+
+=== Documentation format
+
+Docs are AsciiDoc (`+.adoc+`) by default, including `+README.adoc+`. The
+GitHub-required community-health files stay Markdown: `+SECURITY.md+`,
+`+CONTRIBUTING.md+`, `+CODE_OF_CONDUCT.md+`, `+CHANGELOG.md+`. Do not
+add a `+.md+` duplicate of a doc that already exists as `+.adoc+`.
+
+=== Pull requests
+
+[arabic]
+. Branch from `+main+` — do not push to `+main+` directly; branch
+protection requires review and passing checks.
+. Keep the change focused, and explain _why_ in the PR body.
+. Make sure governance CI is green. It checks documentation presence,
+packaging policy, secrets, licence consistency and workflow security.
+. Security issues: follow `+SECURITY.md+` — report privately, never in a
+public issue.