Centralize durable schema migration ownership

crates/remora-schema/migrations/result/0001_result_inventory.sql

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+CREATE TABLE result_inventories (
+    attempt_id TEXT PRIMARY KEY,
+    state TEXT NOT NULL DEFAULT 'open' CHECK (state IN ('open', 'closed', 'sealed')),
+    manifest_schema_version INTEGER,
+    manifest_id TEXT,
+    manifest_store TEXT,
+    manifest_bucket TEXT,
+    manifest_key TEXT,
+    manifest_version_id TEXT,
+    manifest_sha256 TEXT,
+    manifest_size BIGINT,
+    member_count BIGINT NOT NULL DEFAULT 0 CHECK (member_count >= 0),
+    total_bytes BIGINT NOT NULL DEFAULT 0 CHECK (total_bytes >= 0),
+    CHECK (
+        (state <> 'sealed' AND manifest_schema_version IS NULL AND manifest_id IS NULL
+            AND manifest_store IS NULL AND manifest_bucket IS NULL AND manifest_key IS NULL
+            AND manifest_version_id IS NULL AND manifest_sha256 IS NULL AND manifest_size IS NULL)
+        OR
+        (state = 'sealed' AND manifest_schema_version IS NOT NULL AND manifest_id IS NOT NULL
+            AND manifest_store IS NOT NULL AND manifest_bucket IS NOT NULL AND manifest_key IS NOT NULL
+            AND manifest_sha256 IS NOT NULL AND manifest_size IS NOT NULL)
+    )
+);
+
+CREATE TABLE result_inventory_members (
+    attempt_id TEXT NOT NULL REFERENCES result_inventories(attempt_id) ON DELETE CASCADE,
+    member_id TEXT COLLATE "C" NOT NULL,
+    path TEXT COLLATE "C" NOT NULL,
+    size BIGINT NOT NULL CHECK (size >= 0),
+    object_store TEXT NOT NULL,
+    object_bucket TEXT NOT NULL,
+    object_key TEXT NOT NULL,
+    object_version_id TEXT,
+    object_sha256 TEXT NOT NULL,
+    PRIMARY KEY (attempt_id, member_id),
+    UNIQUE (attempt_id, path)
+);
+
+CREATE INDEX result_inventory_members_order_idx
+    ON result_inventory_members (attempt_id, path, member_id);

crates/remora-schema/migrations/result/0002_inventory_ownership_transfer.sql

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+ALTER TABLE result_inventory_members
+    DROP CONSTRAINT result_inventory_members_attempt_id_fkey,
+    ADD CONSTRAINT result_inventory_members_attempt_id_fkey
+        FOREIGN KEY (attempt_id)
+        REFERENCES result_inventories (attempt_id)
+        ON UPDATE CASCADE
+        ON DELETE CASCADE
+        DEFERRABLE INITIALLY DEFERRED;
+
+ALTER TABLE result_inventories
+    ADD COLUMN staging_origin_attempt_id TEXT,
+    ADD COLUMN target_prefix TEXT,
+    ADD CONSTRAINT result_inventories_staging_binding_check CHECK (
+        (staging_origin_attempt_id IS NULL) = (target_prefix IS NULL)
+    );
+
+UPDATE result_inventories
+SET staging_origin_attempt_id = attempt_id,
+    target_prefix = '';