feat(runtime): add local codex daemon pairing

server/migrations/004_agent_runtime_loop.up.sql

@@ -0,0 +1,92 @@
+CREATE TABLE agent_runtime (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    workspace_id UUID NOT NULL REFERENCES workspace(id) ON DELETE CASCADE,
+    daemon_id TEXT,
+    name TEXT NOT NULL,
+    runtime_mode TEXT NOT NULL CHECK (runtime_mode IN ('local', 'cloud')),
+    provider TEXT NOT NULL,
+    status TEXT NOT NULL DEFAULT 'offline' CHECK (status IN ('online', 'offline')),
+    device_info TEXT NOT NULL DEFAULT '',
+    metadata JSONB NOT NULL DEFAULT '{}',
+    last_seen_at TIMESTAMPTZ,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    UNIQUE (workspace_id, daemon_id, provider)
+);
+
+ALTER TABLE agent
+    ADD COLUMN runtime_id UUID;
+
+INSERT INTO agent_runtime (
+    workspace_id,
+    daemon_id,
+    name,
+    runtime_mode,
+    provider,
+    status,
+    device_info,
+    metadata,
+    last_seen_at,
+    created_at,
+    updated_at
+)
+SELECT
+    a.workspace_id,
+    NULL,
+    COALESCE(NULLIF(a.runtime_config->>'runtime_name', ''), a.name || ' Runtime'),
+    a.runtime_mode,
+    COALESCE(
+        NULLIF(a.runtime_config->>'provider', ''),
+        CASE
+            WHEN a.runtime_mode = 'cloud' THEN 'multica_agent'
+            ELSE 'legacy_local'
+        END
+    ),
+    CASE
+        WHEN a.status = 'offline' THEN 'offline'
+        ELSE 'online'
+    END,
+    COALESCE(
+        NULLIF(a.runtime_config->>'runtime_name', ''),
+        CASE
+            WHEN a.runtime_mode = 'cloud' THEN 'Cloud runtime'
+            ELSE 'Local runtime'
+        END
+    ),
+    jsonb_build_object('migrated_agent_id', a.id::text),
+    CASE
+        WHEN a.status = 'offline' THEN NULL
+        ELSE a.updated_at
+    END,
+    a.created_at,
+    a.updated_at
+FROM agent a;
+
+UPDATE agent a
+SET runtime_id = ar.id
+FROM agent_runtime ar
+WHERE ar.metadata->>'migrated_agent_id' = a.id::text;
+
+ALTER TABLE agent
+    ALTER COLUMN runtime_id SET NOT NULL,
+    ADD CONSTRAINT agent_runtime_id_fkey
+        FOREIGN KEY (runtime_id) REFERENCES agent_runtime(id) ON DELETE RESTRICT;
+
+ALTER TABLE agent_task_queue
+    ADD COLUMN runtime_id UUID;
+
+UPDATE agent_task_queue atq
+SET runtime_id = a.runtime_id
+FROM agent a
+WHERE a.id = atq.agent_id;
+
+ALTER TABLE agent_task_queue
+    ALTER COLUMN runtime_id SET NOT NULL,
+    ADD CONSTRAINT agent_task_queue_runtime_id_fkey
+        FOREIGN KEY (runtime_id) REFERENCES agent_runtime(id) ON DELETE CASCADE;
+
+CREATE INDEX idx_agent_runtime_workspace ON agent_runtime(workspace_id);
+CREATE INDEX idx_agent_runtime_status ON agent_runtime(workspace_id, status);
+CREATE INDEX idx_agent_task_queue_runtime_pending
+    ON agent_task_queue(runtime_id, priority DESC, created_at ASC)
+    WHERE status IN ('queued', 'dispatched');