WP-0001-T002: registry data model, Alembic, initial migration with retention seed

Schema (src/artifactstore/db/schema.py):
- events table (ADR-0002 source of truth): sequence BIGSERIAL PK, created_at,
  event_type, subject_kind, subject_id, actor, payload (CBOR bytes),
  payload_digest. Indexes on (subject_kind, subject_id) and
  (event_type, sequence).
- artifact_packages, artifact_files, storage_locations, retention_state
  (materialised views over events).
- retention_classes (seed table) and metadata_schemas (config table).
- ADR-0001 columns present: digest_algorithm, digest_primary, digest_sha256,
  content_address. Blueprint tiering columns present: retrieval_tier
  (default 'hot'), restore_status.
- Types portable: SQLAlchemy 2.0 Core with JSON().with_variant(JSONB, 'postgresql'),
  Uuid, LargeBinary, DateTime(timezone=True), Boolean false() default.

Seed (src/artifactstore/db/seed.py): five v1 retention classes (transient,
raw-evidence, summary-evidence, release-evidence, permanent-record) with
default durations in seconds; permanent-record has no expiry.

Alembic:
- alembic.ini with sync sqlite URL default; path_separator=os to silence the
  1.13 deprecation warning.
- migrations/env.py: translates async URLs (+aiosqlite, +asyncpg) to sync
  counterparts at migrate-time so a single ARTIFACTSTORE_DATABASE_URL works
  for both runtime (async) and Alembic (sync).
- migrations/script.py.mako template.
- migrations/versions/20260516_0001_initial.py: metadata.create_all + bulk
  insert of retention class seeds.

Make:
- make migrate: alembic upgrade head (ensures var/ exists).
- make migrate-fresh: drop local SQLite + re-run.

Deps: psycopg[binary] added as optional `postgres` extra (PostgreSQL prod
path; SQLite default for dev needs no extra).

Tests:
- tests/unit/test_db_schema.py: every expected table present; ADR-0001 and
  tiering columns present; seed has the five v1 classes; permanent-record
  has no default_duration; create_all + FK insert + Boolean default
  round-trip on in-memory SQLite.
- tests/integration/test_migrations.py: alembic upgrade head against a
  tempfile SQLite produces all tables (+ alembic_version) and the seed rows.

Gates: ruff clean, mypy --strict clean on 32 files, 38 tests pass.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

uv.lock

@@ -88,6 +88,9 @@ dev = [
     { name = "pytest-asyncio" },
     { name = "ruff" },
 ]
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+]
 
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@@ -111,6 +114,7 @@ requires-dist = [
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     { name = "jcs", specifier = ">=0.2" },
     { name = "mypy", marker = "extra == 'dev'", specifier = ">=1.10" },
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