spec: define organization-wide repository release contract

[szmyty]

Closes #61

Summary

• add the versioned egohygiene.repository-release/v1 specification, JSON Schema, schema fixtures, profile examples, and migration guide;
• add compact AGENTS.md release guidance plus Aether’s dogfooded declaration and safe release:plan|prepare|verify|publish Taskfile handoffs;
• add the portable prepare-repository-release skill with packaged schema/reference validator and deterministic distribution/catalog artifacts;
• require manually dispatched default-branch releases, immutable tags/assets, explicit evidence states, and repository-owned external delivery adapters.

Validation

• python3 -m unittest tests.test_taskfile_workflows tests.test_repository_release_contract
• portable declaration validator exercised against Aether and an installed standalone skill package
• canonical skill validation and Aether skills/specifications/graph/link validation
• distribution source/package byte comparisons and catalog determinism checks

The local runtime lacks the repository's declared jsonschema dev dependency, so the full validator suite was not run locally; CI installs requirements-dev.lock and will exercise the full schema/catalog checks.

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