feat(backends,storage,core,markdown,infra): claude agent sdk backend, session store, transcript seeding, runner isolation

tests/test_session_store.py

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+import os
+import tempfile
+from pathlib import Path
+
+import pytest
+from claude_agent_sdk.testing import run_session_store_conformance
+from sqlalchemy import delete
+
+from beaver_gateway.storage import Database, PostgresSessionStore, TranscriptEntry
+
+POSTGRES_URL = os.environ.get("BEAVER_TEST_DATABASE_URL")
+
+
+async def test_sqlite_conformance() -> None:
+    root = Path(tempfile.mkdtemp(prefix="beaver-store-"))
+    counter = 0
+
+    async def make_store() -> PostgresSessionStore:
+        nonlocal counter
+        counter += 1
+        db = Database(f"sqlite:///{root / f'{counter}.db'}")
+        await db.create_all()
+        return PostgresSessionStore(db)
+
+    await run_session_store_conformance(make_store)
+
+
+@pytest.mark.skipif(POSTGRES_URL is None, reason="BEAVER_TEST_DATABASE_URL not set")
+async def test_postgres_conformance() -> None:
+    assert POSTGRES_URL is not None
+    db = Database(POSTGRES_URL)
+    await db.create_all()
+
+    async def make_store() -> PostgresSessionStore:
+        async with db.session() as session:
+            await session.execute(delete(TranscriptEntry))
+            await session.commit()
+        return PostgresSessionStore(db)
+
+    try:
+        await run_session_store_conformance(make_store)
+    finally:
+        await db.dispose()
+
+
+async def test_append_dedups_by_uuid_and_keeps_floats() -> None:
+    db = Database(f"sqlite:///{tempfile.mkdtemp(prefix='beaver-store-')}/d.db")
+    await db.create_all()
+    store = PostgresSessionStore(db)
+    key = {"project_key": "p", "session_id": "s"}
+    batch = [
+        {"type": "x", "uuid": "a", "n": 1.5},
+        {"type": "y", "n": 2},
+        {"type": "x", "uuid": "a", "n": 999},
+    ]
+    await store.append(key, batch)
+    await store.append(key, batch)
+    loaded = await store.load(key)
+    assert loaded == [
+        {"type": "x", "uuid": "a", "n": 1.5},
+        {"type": "y", "n": 2},
+        {"type": "y", "n": 2},
+    ]
+    assert isinstance(loaded[0]["n"], float)