feat(contracts): 🧠 stabilize Mindgarden v1 model

[szmyty]

Summary

• add an additive contracts/v1/ registry with nine JSON Schema 2020-12 contracts covering common semantics, gardens, sources, knowledge, claims, typed synapses, ordered provenance, projections, and migration history
• establish stable {garden, id} references with optional immutable Git/SHA-256/version revisions and reject mutable branch revisions
• keep lifecycle, epistemic state, confidence, authorship, human review, classification, visibility, and publication authority independent
• make raw sources, agent proposals, and unknown material private/unpublished/unreviewed by default while requiring approved allowlisted public projections
• align ONTOLOGY.md, EPISTEMOLOGY.md, architecture, system inventory, and three new ADRs with the canonical v1 vocabulary
• define non-destructive v0 → v1 compatibility and migration behavior without implementing issue Add deterministic garden initialization and migration #7's migrator or issue Harden validation and private-by-default publication gates #10's hardened validator
• add 10 synthetic golden instances and 16 focused adversarial mutation cases covering privacy, provenance, identity, dates, relationships, extensions, review authority, routing references, migration history, and publication policy
• package the v1 registry in wheel/sdist artifacts while retaining zero runtime dependencies and unchanged v0 CLI behavior

Verification

• python -m unittest discover --start-directory tests --verbose — 40 passed
• all nine schemas pass Draft202012Validator.check_schema
• all golden instances validate through the complete local schema registry
• all 16 adversarial cases fail for their expected JSON Schema keyword
• wheel and source distributions build successfully
• clean offline wheel installation includes share/mindgarden/contracts/v1/ and preserves the working v0 CLI
• unpacked sdist suite passes (38 passed; two distribution-only checks skip because built artifacts are intentionally external)

Compatibility boundary

This PR stabilizes the v1 contract but does not claim v1 runtime support. Root v0 schemas and the 0.1 CLI remain unchanged until #7 implements deterministic init/migration and #10 implements complete v1 validation and privacy diagnostics.

Closes #9

Roadmap-Step: MIG-Q03

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