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_

CHANGELOG.adoc

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+== Changelog
+
+All notable changes to `+modshells+` will be documented in this file.
+
+This file is generated from conventional commits by the
+https://github.com/hyperpolymath/standards/blob/main/.github/workflows/changelog-reusable.yml[`+changelog-reusable.yml+`]
+workflow (`+hyperpolymath/standards#206+`). Adopt the workflow in this
+repo’s CI to keep this file in sync automatically — see
+https://github.com/hyperpolymath/standards/blob/main/templates/cliff.toml[`+templates/cliff.toml+`]
+for the canonical config.
+
+The format follows https://keepachangelog.com/en/1.1.0/[Keep a
+Changelog]; this project aims to follow
+https://semver.org/spec/v2.0.0.html[Semantic Versioning].
+
+=== [Unreleased]
+
+==== Added
+
+* feat(validator): add comprehensive shell validation package
+* feat: Switch mirror workflow to SSH
+* feat(init): Rhodium Standard project structure (v0.0) with Ada, LMDB
+stubs, and GitLab CI.
+
+==== Fixed
+
+* fix(ci): sync hypatia-scan.yml to canonical (#46)
+* fix(ci): point CodeQL at `+actions+` so SAST runs every commit (#72)
+(#41)
+* fix(ci): adopt canonical hypatia-scan.yml (#39)
+* fix(security): update editorconfig SHA and CodeQL language
+* fix: correct author name in CITATION.cff
+* fix(ci): update quality.yml workflow
+* fix: align CodeQL with repo languages (robot-cleaner)
+
+==== Changed
+
+* refactor: Rename project to '`modshells`' for conciseness and update
+GNAT project file (Rhodium Standard).
+
+==== Documentation
+
+* docs(proof): modshells SPARK no-op exemption (reconcile stale audit)
+(#49)
+
+==== CI
+
+* ci(spark): adopt estate SPARK Theatre Gate (#135) (#50)
+
+=== Pre-history
+
+Prior commits to this file’s introduction are recorded in git history
+but not formally classified into Keep-a-Changelog sections. To backfill,
+run `+git cliff -o CHANGELOG.md+` locally using the canonical
+https://github.com/hyperpolymath/standards/blob/main/templates/cliff.toml[`+cliff.toml+`]
+— this is one-shot mechanical work.
+
+'''''

CODE_OF_CONDUCT.adoc

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+== Contributor Covenant Code of Conduct
+
+=== Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in
+our community a harassment-free experience for everyone, regardless of
+age, body size, visible or invisible disability, ethnicity, sex
+characteristics, gender identity and expression, level of experience,
+education, socio-economic status, nationality, personal appearance,
+race, religion, or sexual identity and orientation.
+
+=== Our Standards
+
+Examples of behavior that contributes to a positive environment include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our
+mistakes
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery
+* Trolling, insulting or derogatory comments, and personal or political
+attacks
+* Public or private harassment
+* Publishing others’ private information without explicit permission
+
+=== Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may
+be reported to the project maintainers. All complaints will be reviewed
+and investigated promptly and fairly.
+
+=== Attribution
+
+This Code of Conduct is adapted from the
+https://www.contributor-covenant.org[Contributor Covenant], version 2.1.