feat(package): 📦 add installable Mindgarden CLI

[szmyty]

Summary

• package the dependency-free v0 engine as mindgarden==0.1.0 with explicit domain, application, adapter, and interface boundaries
• expose the unified mindgarden CLI, stable exit codes and diagnostics, version/--version, and a small direct Python API
• retain the four original script paths as thin 0.x compatibility shims
• build complete wheel and source distributions containing the canonical schemas, profiles, templates, docs, shims, and reproducible test fixture
• extend Python 3.12/3.13 CI with clean offline wheel installation plus installed CLI/library smoke tests
• document installation, long-form arguments, compatibility, package boundaries, and roadmap evidence

Verification

• python3 -m unittest discover --start-directory tests --verbose — 35 passed
• python3 -m build --sdist --wheel --outdir ".cache/dist" — wheel and sdist built successfully
• clean venv installed mindgarden==0.1.0 from the local wheel with --no-index
• installed mindgarden --version, mindgarden version, validate, verify, publish verify, and direct library validation passed
• unpacked sdist compatibility suite passed (33 passed, 2 distribution-only checks skipped because artifacts are intentionally external to the unpacked archive)

PyPI release boundary

No provisional artifact is published by this PR. Issue #19 now records public mindgarden==1.0.0 publication through PyPI Trusted Publishing, with checksum/provenance parity, as part of the final release gate.

Closes #8

Roadmap-Step: MIG-Q02

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