fix(bindings): clear clippy pedantic lints and lint bindings in CI (#77)

* fix(bindings): clear clippy pedantic lints and lint bindings in CI

Resolve the pedantic lints that only surfaced under a full
`cargo clippy --workspace` (the CI clippy job covered only the core
crates, so the Python/Node bindings drifted):

- manual_midpoint: `(a + b) / 2.0` -> `f64::midpoint(a, b)` (node + python)
- new_without_default: add `Default` impls for the six no-arg Node nodes
- type_complexity: factor the pivot/Ichimoku return tuples into
  `PivotLevels` / `WoodieLevels` / `IchimokuLines` aliases (python)
- many_single_char_names: allow at crate level — OHLCV batch helpers bind
  the conventional o/h/l/c/v column names

Add a dedicated `clippy-bindings` CI job (ubuntu-only, with Python + Node
toolchains) so future binding lints fail CI instead of slipping through.

* ci: lint Python and Node bindings in a dedicated clippy job

The main `rust` job's clippy step only covers wickra-core/wickra/
wickra-data/wickra-wasm, so pedantic lints in the PyO3/napi bindings
slipped through. Add an ubuntu-only `clippy-bindings` job that
provisions Python + Node (needed by the build scripts) and runs
`cargo clippy -p wickra-node -p wickra-python --all-targets -- -D warnings`.

.github/workflows/ci.yml

@@ -55,6 +55,37 @@ jobs:
         # streaming.
         run: cargo build -p wickra-examples --bins
 
+  # Clippy for the Python and Node bindings. These are kept out of the main
+  # `rust` job because PyO3 / napi build scripts need a Python interpreter and
+  # a Node toolchain on PATH, which the 3-OS matrix job does not provision.
+  # Ubuntu-only is sufficient: the lints are platform-independent.
+  clippy-bindings:
+    name: Clippy bindings
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable branch, 2026-03-27
+        with:
+          components: clippy
+
+      - name: Set up Python
+        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
+        with:
+          python-version: "3.12"
+
+      - name: Set up Node
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        with:
+          node-version: "20"
+
+      - name: Cache cargo
+        uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
+
+      - name: Clippy (bindings, all targets)
+        run: cargo clippy -p wickra-node -p wickra-python --all-targets -- -D warnings
+
   # Verify the crates still build and test on their declared minimum supported
   # Rust version. The workspace pins rust-version = "1.86" — that floor is
   # set by criterion 0.8.2 (the bench dev-dep), which itself rolled past the