docs: correct duckdb cp314 status — wheels available since v1.4.2

duckdb/duckdb-python added Python 3.14 support in v1.4.2 (Nov 2025,
duckdb/duckdb-python#116). Standard pip download with manylinux_2_28_x86_64
works. Removes the erroneous source-build procedure for duckdb.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: smprather

pre_built/ADDING_BINARIES.md

@@ -625,49 +625,15 @@ ships as manylinux_2_27 minimum; `--platform manylinux2014_x86_64` won't find it
 If `pip download` fails even with `manylinux_2_28_x86_64 --only-binary :all:`, the package
 has no pre-built cp314 wheel compatible with EL8 and must be built from source (see below).
 
-### duckdb — pending cp314 wheel (blocker for pygwalker)
+### duckdb cp314 status — resolved in 1.4.2
 
-**Status:** duckdb ≥ 1.1 does not ship cp314 (Python 3.14) wheels on PyPI as of 2026-05.
-Only cp313 and earlier are available. This blocks `pygwalker` installation (duckdb is
-a hard dep of pygwalker).
+**Status (verified 2026-05-27):** duckdb added Python 3.14 support in **v1.4.2** (November 2025,
+via duckdb/duckdb-python#116). cp314 wheels are available on PyPI for duckdb ≥ 1.4.2.
 
-**Resolution path A — wait for upstream:**
-duckdb is actively maintained. Check for cp314 wheels in new releases:
+The standard `pip download` command works:
 ```bash
 pip3.14 download duckdb --platform manylinux_2_28_x86_64 --python-version 3.14 \
-  --only-binary :all: -d /tmp/test-wheels/
+  --only-binary :all: -d pre_built/el8.x86_64.glibc2p28/wheels/
 ```
-Once a cp314 wheel appears, run the full pygwalker wheel download and commit.
 
-**Resolution path B — build duckdb wheel from source on EL8:**
-duckdb uses a bundled CMake build that links nothing from the system (self-contained).
-The resulting wheel will be tagged `linux_x86_64` (not manylinux), which uv accepts
-for local install via `--find-links`:
-
-```bash
-source /opt/rh/gcc-toolset-14/enable
-sudo dnf install -y cmake ninja-build python3-devel
-
-# Clone at latest stable tag
-git clone --depth 1 --branch v1.3.0 https://github.com/duckdb/duckdb.git
-cd duckdb
-
-# Build Python extension
-pip3.14 install build
-python3.14 -m build --wheel
-
-# Resulting wheel in dist/
-ls dist/duckdb-*.whl   # tagged cp314-cp314-linux_x86_64
-
-# Verify glibc requirement (should be ≤ 2.28):
-readelf -V dist/duckdb-*.whl | grep -oE 'GLIBC_[0-9]+\.[0-9]+' | sort -V | tail -1
-
-cp dist/duckdb-*.whl pre_built/el8.x86_64.glibc2p28/wheels/
-./strip_all_elf_binaries
-git add pre_built/ .strip-manifest
-git commit -m "feat(pygwalker): bundle duckdb cp314 wheel (source build)"
-```
-
-Note: `python3.14 -m build` builds against the current environment's glibc (2.28).
-The wheel will NOT be portable to glibc < 2.28 systems, but all EL8 systems have glibc 2.28
-exactly, so this is fine for the loadout's fleet target.
+No source build required. pygwalker's duckdb dep is not a blocker.