feat: 🌱 add deterministic garden initialization and migration

[szmyty]

Summary

• add digest-bound mindgarden init plan/apply/check workflows for repository, personal, and organization garden identities
• add deterministic mindgarden migrate --plan|--apply|--check conversion from validated v0 to conforming v1 records
• preserve stable identifiers, exact Markdown bytes, source provenance, typed relationships, and legacy review evidence without inventing reviewers
• stage complete trees, reject traversal/symlinks/conflicts, retain the untouched v0 tree at .garden.v0, and restore it if atomic cutover fails
• generate role-aware source, knowledge, synapse, and publishing templates while keeping domains/topics independent from folders
• document the review protocol, rollback boundary, compatibility state, and issue Harden validation and private-by-default publication gates #10 validation boundary

Safety and compatibility

• planning and checking are read-only
• apply requires the exact reviewed plan_sha256
• public initialization creates no private overlay or private committed record
• the existing root v0 contracts and agent/publishing commands remain unchanged
• lifecycle checks cover issue Add deterministic garden initialization and migration #7 invariants; hardened general v1 validation remains issue Harden validation and private-by-default publication gates #10
• PyPI publication remains reserved for the final release gate

Verification

• python -m compileall -q src scripts tests
• python -m build --sdist --wheel --outdir ".cache/dist"
• python -m unittest discover --start-directory tests --verbose — 48 passed
• clean, dependency-free wheel install successfully ran init plan/apply/check
• clean wheel install successfully migrated and checked the public v0 fixture
• injected second-rename failure restored the canonical v0 tree byte-for-byte
• generated init and migration JSON records validate against the merged v1 schema registry

Closes #7

[devactivity-app]

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