chore(nodedb-physical): relicense to Apache-2.0

nodedb-physical is a shared crate used by both Origin and NodeDB-Lite.
Align its license with the other shared engine crates (nodedb-graph,
nodedb-vector, nodedb-sql, etc.) by switching from BUSL-1.1 to
Apache-2.0.

Update SPDX headers in all source files and the Cargo.toml license
field accordingly. Also correct two nodedb-graph source files
(params.rs, traversal_options.rs) that were incorrectly carrying
BUSL-1.1 headers.

Author: farhan-syah

nodedb-graph/src/params.rs

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: BUSL-1.1
+// SPDX-License-Identifier: Apache-2.0
 
 //! Graph algorithm enum and parameter bag.
 //!

nodedb-graph/src/traversal_options.rs

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: BUSL-1.1
+// SPDX-License-Identifier: Apache-2.0
 
 //! Per-query graph traversal configuration.
 //!

nodedb-physical/Cargo.toml

@@ -3,7 +3,7 @@ name = "nodedb-physical"
 version.workspace = true
 edition.workspace = true
 rust-version.workspace = true
-license = "BUSL-1.1"
+license = "Apache-2.0"
 readme = "README.md"
 repository.workspace = true
 homepage.workspace = true

nodedb-physical/README.md

@@ -0,0 +1,19 @@
+# `nodedb-physical`
+
+> Shared PhysicalTask IR and `SqlPlan` → `PhysicalPlan` converter
+
+The physical-plan intermediate representation shared by NodeDB Origin and
+Lite. Holds the `PhysicalPlan` / `PhysicalTask` types and the converter that
+lowers a planned `SqlPlan` into engine-dispatchable physical operations, so
+the server and the embedded engine execute from one definition.
+
+## Status
+
+Pre-1.0. APIs may change between minor versions until 1.0. See the
+workspace [`README.md`](../README.md) for the full project overview and
+the GitHub [release notes](https://github.com/NodeDB-Lab/nodedb/releases)
+for per-version changes.
+
+## License
+
+Licensed under the Apache License, Version 2.0 ([`LICENSE-APACHE`](../LICENSE.APACHE-2.0)).

nodedb-physical/src/convert_context.rs

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: BUSL-1.1
+// SPDX-License-Identifier: Apache-2.0
 
 //! Deployment-neutral context threaded through the shared `SqlPlan →
 //! PhysicalPlan` converter helpers in `crate::convert`.

nodedb-physical/src/error.rs

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: BUSL-1.1
+// SPDX-License-Identifier: Apache-2.0
 
 //! Error type for the shared SqlPlan → PhysicalPlan converter helpers.
 //!

nodedb-physical/src/lib.rs

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: BUSL-1.1
+// SPDX-License-Identifier: Apache-2.0
 
 //! Shared physical-plan layer for NodeDB.
 //!

nodedb-physical/src/physical_plan/array.rs

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: BUSL-1.1
+// SPDX-License-Identifier: Apache-2.0
 
 //! Array engine operations dispatched to the Data Plane.
 //!

nodedb-physical/src/physical_plan/cluster_array.rs

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: BUSL-1.1
+// SPDX-License-Identifier: Apache-2.0
 
 //! Control-Plane cluster array operations.
 //!

nodedb-physical/src/physical_plan/columnar.rs

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: BUSL-1.1
+// SPDX-License-Identifier: Apache-2.0
 
 //! Columnar engine base operations dispatched to the Data Plane.
 //!