chore(bindings): move rust crate to crates/lance-graph-python (lance-format#135)

## Summary
- move PyO3 Rust crate from python/ to crates/lance-graph-python
- wire new manifest into workspace, maturin config, Makefile, docs,
examples, and release workflow
- rebuild bindings and run Python tests to validate relocation

## Testing
- cargo check --workspace
- uv run --project . maturin develop
- uv run --project . pytest python/tests -vv

Author: beinan

.github/workflows/release.yml

@@ -121,7 +121,7 @@ jobs:
       if: inputs.release_type != 'current'
       run: |
         cargo check --manifest-path crates/lance-graph/Cargo.toml
-        cargo check --manifest-path python/Cargo.toml
+        cargo check --manifest-path crates/lance-graph-python/Cargo.toml
 
     - name: Create release commit (when version changes)
       if: inputs.release_type != 'current'

AGENTS.md

@@ -2,7 +2,7 @@
 
 ## Project Structure & Module Organization
 - `crates/lance-graph/` hosts the Rust Cypher engine; keep new modules under `src/` and co-locate helpers inside `query/` or feature-specific submodules.
-- `python/src/` contains the PyO3 bridge; `python/python/lance_graph/` holds the pure-Python facade and packaging metadata.
+- `crates/lance-graph-python/src/` contains the PyO3 bridge; `python/python/lance_graph/` holds the pure-Python facade and packaging metadata.
 - `python/python/tests/` stores functional tests; mirror new features with targeted cases here and in the corresponding Rust module.
 - `examples/` demonstrates Cypher usage; update or add examples when introducing new public APIs.
 

Cargo.lock

@@ -2,8 +2,6 @@
 members = [
     "crates/lance-graph",
     "crates/lance-graph-catalog",
-]
-exclude = [
-    "python",
+    "crates/lance-graph-python",
 ]
 resolver = "2"

Cargo.toml

@@ -16,7 +16,7 @@ arrow-schema = "56.2"
 arrow-ipc = "56.2"
 datafusion = { version = "50.3", default-features = false }
 futures = "0.3"
-lance-graph = { path = "../crates/lance-graph" }
+lance-graph = { path = "../lance-graph" }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 pyo3 = { version = "0.25", features = ["extension-module", "abi3-py39", "py-clone"] }

python/Cargo.toml crates/lance-graph-python/Cargo.tomlpython/Cargo.toml renamed to crates/lance-graph-python/Cargo.toml

@@ -54,7 +54,7 @@ Suggested Migration Steps
 3. Split the planner (`Cypher -> LogicalPlan`) into `lance-graph-planner`.
 4. Refactor the Simple executor so it lives in the workspace cleanly (either
    inside the facade crate or as a `lance-graph-simple` crate).
-5. Update `python/Cargo.toml` to depend on the workspace crates.
+5. Update `crates/lance-graph-python/Cargo.toml` to depend on the workspace crates.
 6. Add ADRs for each step under `docs/` to document tradeoffs.
 7. Update GitHub workflows to match the new workspace paths (build, test,
    release/publish), otherwise releases will fail.