feat: switch to opencode

tests/test_storage.py

@@ -1,3 +1,4 @@
+import sqlite3
 from pathlib import Path
 
 import pytest
@@ -101,3 +102,50 @@ async def test_failed_followup_does_not_invalidate_completed_workflow(
     loaded = await storage.latest_workflow("alice", "repo", 3, WorkflowKind.PLAN)
     assert loaded is not None
     assert loaded.status is WorkflowStatus.COMPLETED
+
+
+async def test_opencode_migration_preserves_and_tags_legacy_session_ids(tmp_path: Path) -> None:
+    legacy_migrations = tmp_path / "legacy-migrations"
+    legacy_migrations.mkdir()
+    migrations = Path(__file__).parents[1] / "src" / "agentci" / "migrations"
+    (legacy_migrations / "001_initial.sql").write_text(
+        (migrations / "001_initial.sql").read_text()
+    )
+    database = tmp_path / "legacy.sqlite3"
+    legacy = Storage(database, legacy_migrations)
+    await legacy.initialize()
+    with sqlite3.connect(database) as connection:
+        connection.execute(
+            """
+            INSERT INTO workflows (
+                id, kind, repo_owner, repo_name, issue_number, base_sha,
+                workspace_path, primary_session_id, reviewer_session_id,
+                artifact, status, created_at, updated_at
+            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+            """,
+            (
+                "legacy-workflow",
+                "plan",
+                "alice",
+                "repo",
+                3,
+                "abc",
+                str(tmp_path / "repo"),
+                "legacy-primary",
+                "legacy-reviewer",
+                "# Preserved plan",
+                "completed",
+                "2026-07-20T00:00:00+00:00",
+                "2026-07-20T00:00:00+00:00",
+            ),
+        )
+
+    migrated = Storage(database, migrations)
+    await migrated.initialize()
+    loaded = await migrated.latest_workflow("alice", "repo", 3, WorkflowKind.PLAN)
+
+    assert loaded is not None
+    assert loaded.artifact == "# Preserved plan"
+    assert loaded.primary_session_id == "legacy-primary"
+    assert loaded.reviewer_session_id == "legacy-reviewer"
+    assert loaded.runtime == "codex"